I was thinking of thanking the editor for considering the paper and I look forward to hearing reviewer’s comments making changes if need be. Does this seem unprofessional or strange?
No need to do this. I wouldn't necessarily say it rises to the level of unprofessionalness, but it is "noise".
It's fine to include a brief thank you just out of politeness if you have some other reason for correspondence, but I definitely wouldn't send an email simply to thank, and there is no correspondence needed at this time.
That is fine, just be brief:
Dear [editor], I just received the notification that our manuscript been sent out for review. Please let me know if there is anything more we should do. Thank you, Sincerely, [corresponding author]
Thanking editor will not change anything or influence the process at all