First, find a good trainer that is willing to come to you (or you trailer the horse to them) for lessons. Hands-on help is bar-none the best when learning how to break a horse.
I would buy the book "From Birth to Backing" on Amazon
.com. It's a great reference guide and has a trouble shooting section and lots of photos. It's written by an English trainer, but the fundamentals are universal.
Also read these articles on horse maturation. Breaking a horse at 2 is just not a good idea. You can buy a yearling or two year old and spend the first years doing ground work, getting him used to a saddle, hand walking on the trail, ponying from a bomb proof horse, and doing everything else you should do before getting on, but I would not start real under saddle training until closer to 3yrs old or after 3yrs old. Those knees need to be good and closed and the hocks on their way to closing (usually 4-4.5 yrs old is when the hocks close). No hard work (like barrels, cutting, jumping, etc) until after 5yrs old, closer to 6. That is, if you want your new horse to be sound for life and riding and competing well into his mid to late 20s. And They Call Us Horse Lovers - Articles http://www.equinestudies.org/ranger_..._2008_pdf1.pdf