Answer
Before creating the bot, i suggest you to learn about the bot at our blog, and join our telegram group t.me/PionexEN to see what other users do.
For starting , you can use grid bot in BTC/USDT or ETH/USDT. With 50$ i suggest you to create grid bot at MBTC/USDT which is the same movement as Bitcoin with 1:1000 ratio.