Can you help me with YuGiOh rules?

1. The max number of cards you can have in your hand is 6. If by your endphase (end turn) you have more than 6 cards in your hand you must discard (send cards from your hand to the graveyard) until you have 6. Technically, there is no limit to what enraged muka mukas attack can be on your turn as you only have to discard if you have more than 6 cards in your hand at the end of the turn however it will generally be +2400 (it is +400 for each card right? correct me if I am wrong). 3. Yes you have to draw at the beginning of your turn (many noobs ume you star with 6 cards but you actually start with 5 and draw at the beginning of your turn). 4.That depends on the effect. Normally unless it says once per turn there is no limit I dont know of any but their may be exceptions. If you are askining about muka mukas effect, it is continous so it stays in effect so long as muka muka is on the field. well sorry if this is hard to read (I`m using a phone) good luck in futre duels :D