CDL TRAINING IN TEXAS?

I am 19 I will be 20 next month in May and I was wondering what are the steps for cdl training. I found there are 2 ways of obtaining a cdl but I still don't fully understand the whole process. first, if I study the dmv book on my own will I need a company provided truck to test or do I get my permit for skills test then try to find a company willing to hire a 20 year old then I go take the driving test with my permit? are there any companies willing to hire me at my age if I take the skills test and obtain my permit? Second, are there companies willing to hire me and train me at my age? I understand there will be a contract involved and I'm fine with a one year deal as long as I get my Class-A CDL. I see a lot of those ads about "PAID CDL TRAINING" are those towards 21 and up? OR can I still apply myself. Last, if I am able to apply at my age where are these schools or companies located near San Angelo, TX? I really want my CDL and I am wondering if it's even worth studying the book or getting classroom training at my age. My goal is to get my CDL do the one year residency with the company who takes me in and by the time I'm 21 be able to join with any company and work across country. Please help me fully understand my situation so I can start my career.