I agree with gsandel on pretty much everything he said. I would just buy 2 batches of yeast and pitch a packet in each beer.
Also, as a person who started homebrewing not too long ago, I would recommend making 5 gallon batches if you can for a while, until you get your pipeline going. At 5 gallons, it took me 4 batches in 4 weeks to get to the point where I had enough beer in the pipeline that I could drop down to 1-2 brews a month. Obviously this depends on how much you drink, and how much your friends start drinking once they realize you make good beer.