My $0.02 =)
Ive a firm believer, Zombies, Riots, world Chaos. Im going to stick with whats abundant in my area. That of course is the AR platform M4/M16. Parts and ammo are definitely much more accessible in addition that you may be able to strip them from "Others" (Military, Law enforcement).
Secondly, barricading is nice, but making sure your are is not so big area that you have to spend time checking each and every door to secure the area. In addition its unfortunate but the biggest error, is Human error, going to larger fortified areas will attract more people. More people means Zombies will be attracted to that location. Humans make to many errors and having to baby sit each person to make sure they are doing everything they can for the group is almost impossible because once fight or flight happens only self preservation exist and they for get their duty to others. (That unless you are actually with trained people)
#1 fortify in a small condo area (masonry construction, small condos usually have only 1 entrance and are in city areas so acquiring things will be in easier distance then country), preferably walk up so as to barricade and not have to rely on electricity.
#2 As selfish as it be, travel in small packs. Large groups are great but the "Laws of Attraction" Zombies will follow
#3 Necessities necessities necessities. Weapons, Food, Water and bug out bag "K.I.S.S" (Keep it simple stupid)
#4 Learn your enemy, gain any tactical advantage as possible. Do the Zombies have a weakness....i.e. (Smell only, transmutes only through biting, airborne carrier, slow moving etc.)
As response to OP.
Weapons wise, Simple M4 in my book seems to make sense to me. 10/22 is definitely something I did not think about thats making more and more sense though. Simple side arm as back up 1911/92F. and of course something long as a last ditch effort. (Sword, Bat, large Knife) anything that doesnt rely on anything else but human means.
and luck....LOL of course this is the tip of the iceberg especially if you 1 month to plan this out, if not this is what I have on the fly. Cause Im looking for Tom G and telling him I can be an asset let me in LOL!