hey telapov,
welcome to steemit and good to hear you are interested in getting into crypto currency. A couple hundred dollars is more than enough to get started, and now is a good time to buy considering the current market dip that has happened. Just be careful out there, it only takes seconds to turn a few hundred into 0. My two best pieces of advice I can offer you are to avoid troll boxes, avoid pump and dumps! Feel free to follow me, I post regularly about crypto currency. and Good Luck!