I've never purchased a "binder". Recently been looking into it, because frankly my "method" gets annoying. When I tell you what it is most of you will think WHAAAAAAAAAAT, but hey...it works

I duct tape. Started it at a very young age, and perfected it along the way lol. As long as I don't keep it on over night, I'm ok. I just NEED to have them completely flat. But over the years, I get scars. Not very visible but I can see them..from where after wearing it overnight (after a long night, whatever the case) the tape will dig in and cut.
It didn't really bother me until one night I was sitting on the couch in my "wife beater" wasn't bound down, and my ex saw a scab about 5 inches long on my side. She burst into tears. I was like "What what?!?!". And she said she couldn't believe the measures I go through to just feel comfortable.
Still doesn't bother me, but once I do have surgery, I dont want to have a whole bunch of scars when Im shirtless.
So question is, do binders bind really well? I honestly don't know my "size" Iv'e never worn a bra in my life. I'm guessing a B. Just wondering if any guys can give me some insite on what's the best one to get and so forth? Thanks.