To activate the cheats you must right click on the shortcut. Go to the properties and you will see a box that reads target. Type outside of the quotations +set cheats 1 +set ui_console 1 +set thereisnomonkey 1.
After you have activated the cheat press ~ to bring up your console and type in one of these cheats (you must enable the console in your options under advanced):

dog- god mode
fullheal- full health
wuss- all weapons and ammo
noclip- noclipping(you can go through walls)
notarget- invisibility
tele x y z- teleport to the location x y z
coord- shows current coordinates
list inventory- lists your inventory
kill- you commit suicide
gameversion- shows game version
toggle cg_3rd_person- 3rd person view
maplist- generates a list of maps
map [map name]- warp to level(see lists)
giveweapon weapons/(weapon name).tik- spawns indicated weapon (see lists)

list of weapons:

colt45
silencedpistol
webley_revolver
nagant_revolver
sten
springfield
t hompsonsmg
ppsh_smg
bar
enfield
g43
mp44
kar98
kar98sniper
mp40
mosin_nagant_rifl e
svt_rifle
p38
m2frag_grenade
steilhandgranate
nebelhandgranate
mills_grenade
rdg- 1_smoke_grenade
m18_smoke_grenade
bazooka
panzerschreck
shotgun
mg42carryable

mapn ame:

t1l1, t1l2, t1l3
t2l1, t2l2, t2l3, t214
t3l1, t3l2

m1l1, m1l2a, m1l2b, m1l3a, m1l3b, m1l3c
m2l1, m212a, m212b, m2l2c, m2l3
m311a, m3l1b, m3l2, m313
m4l0, m4l1, m4l2, m4l3
m5l1a, m5l1b, m5l2a, m5l2b, m513
m6l1a, m6l1b, m6l1c, m6l2a, m6l2b, m6l3a, m6l3b, m6l3c, m6l3d, m6l3e.