What size tippet is recommended for the different fly sizes? I never know excactly what size I should be using so I sometimes worry if it's effecting it.

I think general rule of thumb is divide fly size by 3 ie. a size 24 would be 8x I tend to go a little heavier though and never go smaller than 6x but that is just me

I am with you, I never go smaller than 6X either, even on size 32's. But I do like flouro.