To actually buy and sell shares is fairly straightforward as it can be done online with several brokers, you just have to set up an online trading account. I use the Barclays Stockbrokers - basic but gets the job done, although I am toying with the idea of going for their BARX trading platform which gives access to L2 data which I have been playing with on a trial basis with ADVFN for a while.
To get free stock market streaming prices I use ADVFN -
http://www.advfn.com - go onto that website and then register with them - it costs nothing unless you upgrade to one of their premium services.
More importantly, have you decided what sort of trading you want to do? i.e. do you want to buy some shares and sit back and watch them rise in value (hopefully) and collect any dividends twice a year? or do you some fast action as a Day Trader? If the former, you can go into any UK bank and buy the shares through their share dealing service - they will tell you everything you need to know and do to get your shares. If the latter..............then I
STRONGLY suggest you do a LOT of research and watching of share prices - read as much as you can and learn the terminology, the tools, the strategies, the players, the markets, learn to listen to the business news whenever and wherever its available, above all, learn to set emotions to one side and deal solely based on your own research and goals and NEVER be ashamed to take a profit (e.g. don't keep watching a stock after you have sold and seeing it rise further say to yourself "if only"), and most importantly of all,
ONLY TRADE WHAT YOU CAN AFFORD TO LOSE!!Also, if you do decide to Day Trade, make sure you have the time to sit and watch what is happening on the stock market and be ready to trade when the signals you have set yourself are reached...................oh, and NEVER trade before 10am UK time..............gives the market time to settle down after the fuss surrounding the opening auction.
So, if that hasn't frightened you off, nothing will...........so good luck
chris