To be successful in your shady affairs, you need to arm and dress to match. Items and guns are dropped at the local market (official store). You can buy them for $MTL, the drops are limited.
There may be 100 Desert Eagles, 5 Ak-47 and so on. It’s the same with clothes. There are common ones, there are super rare ones.
Clothes and guns increase not only your characteristics, but also the chance of a successful robbery or raid.
Also, there are plenty of various overhead accessories, such as giant batteries on the back, which will increase the supply of energy and speed up its replenishment. Dope accessories: boombox, chains, stereo glasses and so on.