I'll assume you did get the "Trainer Activated" when you hit F1.
For salvage and skill points, and I think add experience also, those do not work until after you've killed the deer in the first wooded area. Somewhere around that portion of the game it will work, maybe after you've been back to that first campsite. I know the Add Salvage didn't work for me until I had actually collected some salvage.
You shouldn't really need any of these until you've gone through the bunker and find Sam and Mathias at the first real campsite. Just hold off on adding any trainer cheats until you wake up from that cut scene and you'll notice they all work as intended.
Also, be sure to 'Run As Administrator'. Often these trainers won't be able to patch memory locations, add hooks, etc, without it.