if your looking for a good blocking FB, slow build you need to save all SP until you can go direct to first cap. EI, train to 25 then us 23 sp to get to 48. FBs boost even so you should be at 25.00 with mean you can cheat and get to 49 with 1 for 1. If you have 48.4 it will cost 2 sp to get to 49.4.
What this does is allow you to train longer at a higher % of training. Start with str, block. Agility and Vision next. You need speed to keep up with a HB but FBs don't get any boosting points so you can always do it later. Get 3-4 majors up fist or you can get 1-2 to second cap first....your choice.