Hi again Dave,
Thanks for your response.
If you plan on playing cash games with the $50 you would be rolled for NL2 while implementing the BSS (Big Stack Strategy) Whilst you would only have 25 buy-ins for this limit, you should be okay as long as you stick strictly to our strategy guide.
Another option would be our MSS (Mid Stack Strategy) Here you would able to play NL5. Again you would 25 Buy-ins for this, which is more than enough to successfully sustain your Bankroll.
However, and this is a personal suggestion. If you do chose to play MSS, I would start out at NL2 for couple of days. It would give you more time to get used to the strategy and if you were to make mistakes, they would cost you less.
I have linked all the information you need for the strategies above and I also think it would be a good idea to read these Psychology articles also.
It's very important when starting off, that you give yourself every chance to become the best you can be. A lot of people neglect the psychological aspect of the game and it can be very important in the long run.
Hope I helped and if you have any further questions please do not hesitate to ask 
Kind regards,
Gary