New to saltwater fly fishing...

[Fisherdan]

i REALY want to do saltwater fly fishing, now that i have done a bit of it in the river tay. but there is a load of questions i need to ask so i am just going to fire away.

1. can i use a normal freshwater fly fishing rod or do i need a saltwater fly rod? and was is the difference?

2. what places am i looking for when i do saltwater fly fishing? ( small river.. etc.)

3. what species can i catch? ( in UK )

4. are the same tactics used for freshwater fly fishing, to saltwater fly fishing ( roll cast.. etc. )

thanks..