get unlimited health and work on the stuff till they hit ledendary but it will take a few days here are two cheats put them in at the pause menu.
unlimited health:u,u,u,l,d,d,d,l,u,u,u,l,r
unlimited ammo:u,d,l,d,d,l,d,d,l,d,d,d,l,r
u=up
d=down
l=left
r=right
hope it helps you out.