Line choice any recommendations for a 5wt.
Yes, a 6wt
I'm on an Outbound Short float / intermediate and I put a poly on the end if required these days. This is available in a #5 but would be a special order in UK as the distributors do not carry them. You'd want a fairly brutal #5 rod to put it on too.
If you've a #7 rod, you'd be far better using is for streamer work, it is tough going on a 5wt set up.
Flies, you can tie them, they don't need to be too fancy. I'm sure that there are places that you could get them but I've not found anywhere in the UK that supplies what I tend to fish, if I could buy them I would!
Cheers
Ben