I think 100$ is not a healthy capital. So need to strongly maintain the money management for your 100$. I think you need to open a trade with 0.05 lot. And never open to many trade in a same time. And always use the take profit and the stop loss. Your master plan can make a big capital by this small capital.

It is enough for me to use 10 lots as it is very dangerous to use large lots because it can possibly kill your account. Never use large lots if you are not capable enought o handle your account nor if you are less knowledgeable about its usage.