These are only my recommendations anbd some will clearly be debated by other surgeons so here goes:
1) You will likely need a breast lift.
2) Placement of the implants beneath the muscle will provide you with additional support to help minimize long term ptosis of the implant. Implants on top of the muscle in patients with loose parenchyma skin tend to develop the "rock in the sock" appearance whereas implants under the muscle tend more towards a "snoopy" appearance
3) Consider an implant on the smaller side to minimize longterm garavitational effects i.e., less than 300cc
4) Favor higher profile implants to minimize rippling
5) Favor silicone implants for a more natural feeling/appearing breast in a thin skinned and samll breasted individual
6) Consider (not currently popular) textured implants to make them "stick" and prevent gravitational descent. However, they have other disadvantages and while they are popular in Europe, they are not commonly used in the USA.
7) Once augmented, wear a supportive bra at all times 365 days a year 24x7 (even at night) to support the breast and minimize the effects of gravity on your skin.
I hope this helps.