A quick guide
1 : Upgrade colts reload to the max and its damage
2 : upgrade builders to lvl 1
3 : upgrade scavengers to lvl 1
4 : Now save money for ruger mp9 or scorpion
5 : Upgrade its damage and reload time
6 : Fully upgrade scorpion takes u to the lvl 33 easily
7 : Clips are a not important upgrade
8 : Fortify motel to lvl 1
9 : Save money for steyr and did not buy shotgun its a waste of money
10 : upgrade scavengers , builders , fortifying and for assistant
11 : When at lvl 50 upgrade your Aids and myxomatosis
12 : Then buy XM134 minigun its important after lvl 50
13 : upgrade everything to lvl 5
14 : after completing lvl 59 buy ammo's for minigun and 20 genegrades for the bunny Queen .
Hope its help ,
Sorry for my bad english and
if it works for you then click + button for others
Have fun :)
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