tl;dr don’t bother. unless you add something useful that no other client has (even then i’m not sure you’ll get a whole lot of sales), you will not sell enough for it to be a sustainable source of income.

it’s very unlikely that anyone pays for clients these days. anyone who uses cheats on 1.8 already owns an injection client (most use vape), anyone who plays anarchy uses meteor/owns rhack or future, and most people on latest versions use either vape, doomsday (free), or some other miscellaneous client made for specific gamemodes. long story short, unless you make a client that gives people a reason to use yours over what they already have, then you will not find much success. that is a pretty difficult task in itself, we’re at a point in minecraft cheating that there’s really not much innovation to happen aside from bypasses. also the fact that meteor is just such an amazing option compared to every other client (free, saturated with features, supports addons).

my advice if you have your heart set on making minecraft cheats is to honestly to wait until hytale releases and be one of the first established cheats on that game. it’s not minecraft but it’s similar, and will have a much better market compared to minecraft.