If we are talking about pokerstars, then we can confidently say that slow SNG 9max (knockout) is the easiest discipline. Mtsng can cause you difficulties. In addition, in my opinion, you do not need to play 45max, because it is more difficult to get into the prize zone in them (my opinion). Try a slow 9 max knockout or a slow 180 max for 1$
If I started to play with such a small bankroll, I would play cash on the strategy of medium stacks. ( that's about 62 buy-ins ) But this is only my opinion, if you have difficulty with the cash, do not do so.