Personally, I think what you're doing is a good way to start. Rocksmith will prepare you physically and you will be learning songs you like right off the bat ( a nice source of inspiration, IMO), and the theory will give you a good foundation and prepare you for becoming a "serious" musician. You may want to branch out at some point and maybe take lessons or the like, as shwabilly said, there are tons of resources on the web that can help. I kinda wish I had RS and the stuff on the web when I was starting out, I believe I would have turned out a much better player than I am now.
As long as you work at it, and are committed to improving, you should do fine.
You can call me ...Cliff.
"If I could walk that way, I wouldn't need the talcum powder."