Bag Gloves for big guy - recommendations?

[geminus]

Hello all...I'm very new to the sport and have been thinking about buying myself a heavy bag and some gloves. I am pretty big and wasn't sure what I should buy. I'm 6'1" and 335 pounds so I was wondering if I'd be better off with a 100 pound bag or an 80 pound bag? Also...what size...because of my size should I be focusing on something a little heavier i.e. 16oz?

My hands are normal to large. Are there any brands I should stay away from (ones that are notoriously noarrow etc)?

I thank you all for your time and replies.

Tom