I would say stay in the 2nl (1c/2c) until you have 50$. Then you can either move up or try some kind of sng's.
(if you are good at hu, 20$ is probably enough for building a stack in hu sng's).
Of course as stated above, the risk of going broke is aparent, but with some luck to start with and some good brm after that I belive you can do it.