Probably like 100$ BTC...
It's so little amount of money for trading. You will be scammed isnstantly i recommend to start with 2 - 3 bitcoins cause always need to have reserve money...
I think for the capital it depends on your budget dude. if you only have $ 100 you should be able to take advantage of it.
Lol no correlation between a small capital with scammed ?
My advice when you only have a small capital. you could try to trade on altcoin its more profitable if you have small capital