I hate to keep bringing this up, but the US Army's H2H program is significantly influenced by BJJ. If you want an advantage prior to training, I would get some grappling experience.
I doubt you will be able to learn enough about using pressure points to make a big difference. First, learn how to fight. After you have standup, clinch and ground skills, then add pressure points to your game. There is a sequence that will make things easier.