Well then you might want to add a few more patterns--- like some classic wets. Generally they're not as popular over here, so you don't tend to see them in many of the American beginning fly tying books, but since you're in Scotland...
Definitely tie up the stuff that you'll fish--- nymph patterns like the pheasant tail and gold ribbed hare's ear would be very good to start, and dry patterns like the Elk Hair Caddis and Adams might be a little more difficult and require more expensive materials (dry fly hackle) but would be great to add.
Some classic Loch style flies might be good to take on and sort of slot in between nymphs and dries in terms of difficulty and price of materials. If you wanted to tackle some you could do them in order of difficulty:
Wingless with simple hackle collar (Black and Peacock, Black Pennell)
Wingless with palmered hackle (Kate McLaren, Zulu, Soldier Palmer, Biblio)
Winged wets (Bloa and Black, Lug and Plover/Woodcock, Wickham's Fancy)
Some of the material that you'll find in Scotland will be a bit different than in the US like the availability of seal's fur dubbing and Kamasan hooks (Nymph B175, Wet B170, Dry B401) and the more widespread use/availability of paired wings (snipe, woodcock, mallard, jay etc).
Not sure where you are in Scotland, but some good resources for you include the fly dressers guild The FDG
with branches in Edinburgh, Luggiebank and Ayrshire (also an informative site with pattern library), the Milngavie Fly Dresser's in Glasglow (google them to find out about tying classes) and The Step by Step Fly Tying Resource
with an extensive pattern library and step by steps for tying a lot of popular British and Scottish patterns.
If you have a local fly shop, they can recommend simple and effective patterns, and/or pick out material for the fly patterns you want to tie (and advise you on substitutes that you may have that would work perfectly well). If you don't have a local flyshop, something like the following list might be good for a start to tie nymphs (Gold Ribbed Hares Ear, Pheasant Tail, Diawl Bach) and a bunch of wets (Black and Peacock, Black Pennell, Zulu, Kate McLaren, Blae and Black, Invicta, Greenwell's Glory etc):
Hooks: Nymph Kamasan B175 size 12-16, Wet fly (Kamasan B170) size 10-14
Thread: Black and brown 6/0 (or 140 denier)
Peacock: Herl and swords
Floss: Black, red
Dubbing: an assortment of seal's fur (or substitute) or just black, yellowish-amber and red for now, and a Hares mask (natural color)
Wire: Fine copper and gold
Tinsel: Fine silver and gold oval, double-sided silver/gold flat tinsel
Hen Hackle: Black, Brown, Ginger
Rooster hackle: Black, Brown, Ginger (not sure if you need dry fly quality hackle for these wets, you may be able to get less expensive rooster)
Wings: pair of mallard wings for now (to use on winged patterns in place of woodcock, jay etc)
Ringneck Pheasant: tail feathers
Other: Golden Pheasant head (crest and tippets), bronze mallard feathers, starling skin ( slips from wing flight feathers can be used on many wets for wings, and many feathers for soft hackle collars on wets from back and upper/lower wing coverts-- a very useful and inexpensive thing to have)
Dry flies will require some additional materials including dry fly hooks (Kamasan B401 size 12-18), an assortment of dry fly dubbing (like Superfine), and there are many options for other materials depending on the patterns. Dry fly quality hackle can be expensive-- but some alternatives are dries tied with CDC like the F-fly and/or hair like the Sparkle Dun, X Caddis, CDC and Elk-(all actually tied with deer hair sold as "coastal" or "compardun" deer hair).
Good luck- and feel free to post pics of your flies we'd all enjoy seeing them if you want some constructive feedback just ask-- And also feel free to jump in on the fly swaps-- everyone is always welcome, regardless of tying experience.