I would recommend Starting Strength for nearly any beginner who wants to get bigger and stronger. I wish I had followed a program like this when I was starting out. I would have made more progress in my first year or two than I did in 10+ years.
I also wouldn't necessarily change your training program every 6-8 weeks either. Do SS and milk the linear progress for as long as you possibly can. If done correctly, you can reach a decent level of strength faster than most people.
I also wouldn't worry about trying to lift in a specific weight class right now. You're just beginning, so don't limit yourself my trying to stay in a low weight class. Eat enough to get stronger and don't be afraid to gain some weight. As long as you don't get massively fat in the weight gain process, gaining weight will help you get stronger at a quicker rate.