You should start out with maybe 1cc of filler and go from there. You do not want to overdo too much filler in the lips. It also depends on the look you are going for too. You can always add more filler to the lips if needed. Just remember if you are going to do your lips and you do not want to bruise you should not take any aspirins or anything that will thin the blood since brusing can occur.
You appear to be an excellent candidate for lip fillers for the upper and lower lips. Please consult an expert for the bet cosmetic results. Best, Dr. Green
Lip Fillers Long Term, Use Cannulas and a Conservative approach
You can easily get larger and more full lips with contour using fillers or fat. I suggest you see an expert. Best, Dr. Emer.
There are a few different ways to help you achieve fuller lips: fillers (usually hyaluronic acid e.g. juvaderm/ restylane), fat injection, silicone implants (Permalip) etc. It would be helpful if you could post some close-up photos of your lips, but better yet, it'd be best to consult with a board certified plastic surgeon in person so he/she can decide which treatment is best for you. Good luck!