newby questions!!

I am a beginner who needs to know the basics of rod weights, reel
weights, and line weights.
I fish for pansize trout in small creeks, half pound steelhead in
small creeks and adult steelhead
in both small creeks and good sized rivers (ie the sacramento river)
and king salmon in good sized
rivers.
I have several reels going from a hardy lrc lightweight all the way up
to a okuma 7-9 weight. (and a
6-8 weight and a sth #2 and a sth #3, the #2 about a 6 weight and the
#3 about a 8 weight)
I have rods going from a 6 weight glass to a tfo 9 weight. I have
lines going from a 6 weight
floating to a 8 weight floating, and just recently bought a sized 2
intermediate orvis floating
line. The flies I use go from size 10 with several split shots to
size 22 dry flies.

What line weights should I use? Does the size of the fly dictate what
size rod to use? Like if
you use a size 22 fly use a 2 weight rod and reel? If you are using
size 12 flys with several
split shots on a 7-8 weight, what is going to be the difference
between a 6 weight line, a 8 weight line,
and a 9 weight line? How would the 2 weight sinking line be on a
7-8 weight rod and reel? How would the hardy lrc handle 2 weight
orvis sinking line?

I am thinking of getting a rod specifically for small creeks using
size 16 -22 drys and nymphs,
how would a 2 weight be? Would I be able to use my lrc on a 2 weight?

If I am throwing alot of lead on a 6-8 weight reel and 7-8 rod should
I use 9 weight line? Would it
make it easier to throw the line and get the sunk fly out from the
water?

What does it mean to "turn over" a fly?