As the runner you met in Houston said, you don't want to overdo it or jump into it too fast. If you have only been "running" for two months, the half may be too much. If you've been running longer (your blog implies more like a year) and only training for the half for two months . . . well, you're better off but would be well advised to go easy at the half.
For the marathon, you could conceivably do it, but most plans recommend peaking around 40 miles per week, with a 20 mile long run. And plans usually run 16 weeks or more. Take a look at the Hal Higdon Novice 1 plan to get some idea. http://www.halhigdon.com/training/51137/Marathon-Novice-1-Training-Program
Good luck.