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Recommended Vitamin Daily Intakes?

Hello! I decided to start the New Year by increasing my daily amount of vitamins, and went to Wall Mart and bought three kinds of vitamin B (B-complex, B6, and B12). Knowing that I am already taking one multi vitamin daily and after reading the labels on the bottle it said they are for Energy Metabolism. Since I am working out and want to increase my metabolism (I eat a little bit more and gain weight), I decided to just go ahead and buy these pills. But I do not want to Over Dose myself. So, I would like to know what does it mean the search I did in the internet. See numbers below:
Age Recommended Allowance
25-50 Vitamin B6 Vitamin B12
mg mcg
Males 2.0 3.0/2.0

Biotin
(B-complex) = 30 µg Biotin in food and as a supplement No information found

Folate
(B-complex) = 400 µg Folate in food and as a supplement Doses larger than 400 µg may cause anaemia and may mask symptoms of a vitamin B12 deficiency

B6=Doses larger than 100 mg may cause numbness and tingling in hands and feet

B12= Doses larger than 3000 µg may cause eye conditions

B Complex = Doses larger than 400 µg may cause anemia and may mask symptoms of a vitamin B12 deficiency

And whats the difference btwn Folate and Biotin B-Complex?

Could someone, please, advise me how much should I take. For further info, the label states for each pill: (B6=100mg), B12 (1000mcg), B-Complex.

I thank you in advance for clarifying it and Happy 2010 to everyone.
Thanks, but can I take all three Bs I bought (B6,B12,Bcomplex) plus the multivitamin? The man at the counter in the pharmacy told me the dosages in these bottles are very little, but I have not explained to him what I was planning to do, maybe cos I was not sure if he was a real pharmacist! Any clues?