Shouldn't this be "feeling" instead of "doing" ? You have used "ago" specifically for "doing" before, and "habeo" for "feeling". Now, you want to act like they're interchangeable ?
This is a conversational question, and as such it can be translated both ways into English.
Is learning vowel length and proper pronunciation important in Latin? Should I memorize "Quomodo me habeo" or "Quōmodo mē habeō"?
If you only plan to read it, no. If you plan on addressing your friends and countrymen, absolutely.
If "how do I feel?" is incorrect the tips need to suggest the use of the word "doing" somehow.
When should one use 'me' versus 'se' ??? My understanding is 'me' is accusative for me and 'se' is accusative for myself ???? correct?
No. "me" is the 1st person, "te" is the 2nd person, and "se" is the third person.
Bene me habeo = I am fine (Literally "I hold myself well.")
Bene te habes = You are fine (Literally "You hold yourself well.")
Bene se habet = He/She is fine (Literally "He/she holds him/herself well.")