A couple of books and a DVD recommendation.
Rivers and Lochs of Scotland – great fishing directory details pretty much all the Trout and Salmon waters in Scotland. Great for planning trips.
Sea Trout Fishing – not fly fishing specific but is one of the best fishing books available.
http://www.amazon.co.uk/Sea-Trout-Fishing-Hugh-Falkus/dp/1841881848
Kiss the Water – a documentary about one of the greatest fly tying masters Megan Boyd from Sutherland. Collections of her work are still in demand today and fetch a fair bit of money at auctions.
http://www.amazon.co.uk/Kiss-The-Water-Eric-Steel/dp/B00IIK6CE2
I second the comments about kits that are available, not very good at all, think along the lines of bike tool kits available from supermarkets. Far better would be one or two quality tools or a nice vice.