All I know is I'm confident about what I've studied and I'm prepared to do the phd study both mentally and physically.

I suspect you may be mistaken - that is, you may not actually ready to engage in doctoral work. Let me briefly explain why:

• Doctoral work is almost exclusively research; it's not simply a higher level of what you've done as an undergraduate. And while a Master's is a bit more of a mix of studying courses and doing research, you can still get through your Master's having the wrong idea about being a junior researcher - for the PhD this typically won't do.
• If you do not feel strongly about studying certain specific subjects, or proving the feasibility of some process/method/idea, or improving some features of established work - more solid objectives for your doctoral and future research work - you might not want to embark on the entire endeavor.
• Continuing the last point - it's not clear what your motivation is beyond obtaining the title of "Doctor of Philosophy". Maybe you do have such motivation, but you've not mentioned it.

So, while you don't necessarily have to have decided on your exact specific research topic before you meet that adviser, I would advise you have a stronger grasp of your intentions and motivations before doing so. Also, the more you know about what it is you want to be doing, the more that will help you choose which potential advisors to seek out and contact.

All I know is I'm confident about what I've studied and I'm prepared to do the phd study both mentally and physically.

I suspect you may be mistaken - that is, you may not actually ready to engage in doctoral work. Let me briefly explain why:

• Doctoral work is almost exclusively "research work" rather than "advanced studies"; it's not simply a higher level of what you've done as an undergraduate. And while a Master's is a bit more of a mix of studying courses and doing research, you can still get through your Master's having the wrong idea about being a junior researcher - for the PhD this typically won't do.
• If you do not feel strongly about studying certain specific subjects, or proving the feasibility of some process/method/idea, or improving some features of established work - more solid objectives for your doctoral and future research work - you might not want to embark on the entire endeavor.
• Continuing the last point - it's not clear what your motivation is beyond obtaining the title of "Doctor of Philosophy". Maybe you do have such motivation, but you've not mentioned it.

So, while you don't necessarily have to have decided on your exact specific research topic before you meet that adviser, I would advise you have a stronger grasp of your intentions and motivations before doing so. Also, the more you know about what it is you want to be doing, the more that will help you choose which potential advisors to seek out and contact.

All I know is I'm confident about what I've studied and I'm prepared to do the phd study both mentally and physically.

I suspect you may be mistaken - that is, you may not actually ready to engage in doctoral work. Let me briefly explain why:

• Doctoral work is almost exclusively research; it's not simply a higher level of what you've done as an undergraduate. And while a Master's is a bit more of a mix of studying courses and doing research, you can still get through your Master's having the wrong idea about being a junior researcher - for the PhD this typically won't do.
• If you do not feel strongly about studying certain specific subjects, or proving the feasibility of some process/method/idea, or improving some features of established work - more solid objectives for your doctoral and future research work - you might not want to embark on the entire endeavor.
• Continuing the last point - it's not clear what your motivation is beyond obtaining the title of "Doctor of Philosophy". Maybe you do have such motivation, but you've not mentioned it.

Getting it together more is always good to do before meeting with potential advisors. Also, it should help you decide which potential advisors to seek out and contact.

All I know is I'm confident about what I've studied and I'm prepared to do the phd study both mentally and physically.

I suspect you may be mistaken - that is, you may not actually ready to engage in doctoral work. Let me briefly explain why:

• Doctoral work is almost exclusively research; it's not simply a higher level of what you've done as an undergraduate. And while a Master's is a bit more of a mix of studying courses and doing research, you can still get through your Master's having the wrong idea about being a junior researcher - for the PhD this typically won't do.
• If you do not feel strongly about studying certain specific subjects, or proving the feasibility of some process/method/idea, or improving some features of established work - more solid objectives for your doctoral and future research work - you might not want to embark on the entire endeavor.
• Continuing the last point - it's not clear what your motivation is beyond obtaining the title of "Doctor of Philosophy". Maybe you do have such motivation, but you've not mentioned it.

So, while you don't necessarily have to have decided on your exact specific research topic before you meet that adviser, I would advise you have a stronger grasp of your intentions and motivations before doing so. Also, the more you know about what it is you want to be doing, the more that will help you choose which potential advisors to seek out and contact.