Kaz, I'm going to need more information from you before I can give you specifics. For instance, I don't know your sexual orientation and who you're trying to appeal to. I pose men differently then I pose women.
Additionally, you mention "self portraits"--so basically selfies. As a general rule, unless you want the stereotypical "here's a nude picture of me holding my phone reflected in the bathroom window" then I'm going to need to know more about what equipment you have and your level of expertise with it. For instance, do you have a tripod (or something to stabilize your camera)? Do you have a remote trigger release?
Finally, be blunt here. What specifically is the medium here you're looking to post on? An escort site? A dating site? IG? A pickup/sexually oriented site?
OK, those unknowns out there (and without answers, I can't give you more details), let me give you some generalities. Poses make all the difference. You can pose in ways that hide weight or minimize unflattering elements (like a belly or a C-scar or big thighs). You can pose in ways that enhance certain assets (making a bust look bigger). Posing and camera angle is critical here.
So without knowing any more details from you, let me offer a couple of general pieces of advice. If you're overweight, put the camera above you (or at least no lower than eye-level). Below eye-level and you gain a double-chin (even if you're thin--even more so if you aren't). Don't face the camera straight on--that adds 5-10 pounds and makes you look heavier. A huge soft box (like 6-8 feet) behind you will make you look thinner as the light wraps around you. Fabric is your friend--so lace or translucent cloth can show form without making things too explicit.
Finally, expect to shoot 200 exposures for everyone single shot you think is a keeper. Selfies that are flattering are tough. Shooting them to minimize your unflattering elements are tougher. Making them look sexy or romantic or hot is tougher still. So the single best advice is engage a professional photographer. Be explicit upfront about what you're looking for. But if you insist upon doing this as a selfie, expect to do a lot of trial and error before you start to go "okay, I light the lighting and backdrop, not I need to get the pose down."