I started about 3 years ago, with a similar amount of land to you, so I'll give you my two-penneth.

Lambs are going to be the most amount of work (worming, flies, weaning etc), so if you want an easy start into sheep I would go for some yearling ewes or wethers. You can get them grazing over summer, and build up some sheep experience, and then come autumn you can decide what to do next - breed, eat them, sell them.
In terms of equipment then, you will be able to get away with a pair of dagging shears, a pair of foot clippers, a handful of hurdles (I have got away with only 4 hurdles, with 6 ewes+lambs for two years - you can make use of existing fences to make a larger enclosure), Crovect (apply after shearing) + applicator, something to dose with (wormer and flukicide) - again you can get away with a reusable syringe and dosing nozzle (see the last page of this (C)
http://catalogue.coxagri.com/library_files/7_drenchers_and_vaccinators.pdf), and then other stuff as you see fit as time goes on. Oh, and I see you are in rainy Wales like me, so I would advise something (covered) to feed hay from - I find that giving them access to hay when it's raining can prevent dirty bottoms, and hence minimises fly strike (assuming you control your worms too). And a bucket - bucket train them, it'll make your life easier.
You will eventually need a livestock trailer too, but you will have time to search out a bargain one.
Tim Tyne's book yes defo, plus books by Agnes Winter: Sheep Health, Husbandry and Disease: A Photographic Guide & The Sheep Keeper's Veterinary Handbook. Also read as much extra things as you can, good sources are: Eblex
http://www.eblex.org.uk/returns/Better-returns-sheep.aspx, HCCMPW
http://www.hccmpw.org.uk/publications/farming_and_industry_development, NADIS
http://www.nadis.org.uk/.You will need to work out how many sheep your land can support - obviously you'll have much more grass in the summer than you will in the winter, so if you want to keep sheep all year around, you might be best off having say 6 sheep, and then closing one field off for silage/haylage/hay in the height of the grass growning season - speak to your farmer neighbour about it, see if he can cut/bale for you. That way you don't end up with too much grass in summer or too little in winter.
As for which breed, well, if you don't already have a preference, have a look around the local farms and see what they have - they will have selected ones that do well in your climate/surroundings. If you think you will want to breed from them, avoid the big breeds like Texels etc - until you have more experience with lambing.
I would get yourself on a course too, even if it's just a one-day'er.