Is this turning into a zombie related thread? If so.... I can help.
With guns, for a longarm, you have to realize that anything other than a headshot wont do much, so it's better to go with a smaller caliber, like a .223. All you need is something that'll go through skull and rattle around in there. If you're not a good shot, get a shotgun, or train up on a rifle.
My dream would be a silenced MP5 kept usually semi with some scope, or at least a reflex sight.
(And just so y'all know, my limited knowledge of guns doesn't come from CoD. I work with guns.)
(On another note, I hate people who talk about guns like they know them, but are just stating things from CoD...)
If you carry a melee weapon, a machete is best. IMO... I do have a good background with blades ( 7 years fencing, 3 of those being a fencing instructor, and assorted other blade training) Just keeping it simple is best.
For a bag; food, water purification thingies, spare clothes, and other junk and stuff. Why am I saying things here, you all got this.