Haha, well BB-(XX) is the number that shows what bey it is. BB-01 is Pegasis 105F (this is an older MFB bey, pre hybrid wheel system, you have a LOT to learn!) 105 is the track height! It's something like 1.05 centimeters if I'm wrong? F means flat! Flat as you would think is for attack. It is outclassed by much better parts such as RF (Rubber Flat) and many others. Anyways, that should have been answered in the Ask a Question, Get an Answer thread, but you're new here, I can cut you some slack since you actually put some effort into that post.
As for buying from that link, you sure that is the correct one? It takes to a page of text/coding. As for a good starter MFB bey, I would suggest Ray Unicorno (Takara Tomy/Sono Kong Name) or Striker if you are only have access to Hasbro items. Ray has great smash, it's in tier 2 of attack. D125 is meh, along with the Unicorno/Striker Clear Wheel, and CS is flat out amazing. Get a Hasbro one they have the best CS's!
Another thing to start off with would be Basalt Horogium, or Twisted Tempo (renamed by Hasbro) Basalt is MUST have in the game at this time. Get Hell Kerbecs along with that, BD145 (Boost Defense) Is a great part overall, it is totally dominating everything right now.
How do I still have 17th most posts here...?