What to do after removing wallpaper?

I have removed the wallpaper in my kitchen and also scd as much of the glue as I can. There is very little remaining and I'm trying to figure out what my next step should be. I have read that I should clean the walls with TSP before priming but I have also read that you can just use Gardz to seal in whatever is left of the glue. I would rather not use the TSP if I can just use the Gardz. Also, there are some large cracks in the wall that have been covered with putty underneath the wallpaper and I'm afraid that if I just use the Gardz and then paint that the putty spots will show through. Do I need to texture the walls or is there another way to ensure the spots won't show?