I enjoy playing Warhamer, but I suck, I'm a horrible player, I still have an absolute blast playing though. I'm more into the painting, modeling, and lore of the game, that said I have always wanted to have an Imperial Guard army, lead by a few Space Marines. So I need your advice in two areas.
1. Lore, and background wise, what Chapters have a good relationship with the Imperial Guard? I haven't read every book out there, and I may be missing something, but I believe the Salamanders, and Space Wolves probably have the best relations with the regulars. I was reading the Dark Angel Codex and from what I gather they don't even talk to the people they are helping. That's kind of lame.

I also really enjoy the new Sternguard models, as well as the Ultramarine color scheme.
2. Like I said, I'm a horrible player, I need all the help I can get. What allies would best help my Imperial Guardsmen to victory? I'm not good at seeing combos, or working things out on paper, so I always have a horrible time making lists. I think Azrael would be good to throw in a Guardsmen blob to give the a 4++, as well as allowing me to use bikes and terminators as troops. Tigurius can use divination and Biomancy on the
IG blob, and reroll to boot. I'm sure there is a lot of stuff I'm missing, I hope those of you that are good at the game can help me figure it out.
3. Imperial Guard seem pretty well rounded, should I stick to a very small allied force just for the purpose of making it thematic, or are there any units that would work well as allies to the Imperial Guard?
I'm sure I won't be able to have my cake and eat it too, but I bet one of you will lead me in the right direction. I appreciate your help, and advice. I hope you guys can turn my losing streak around, and if not at least I'll have a sweet looking army!