I think Brynn is referring to trading as in the short term buying and selling of whatever currency against another currency, eg US dollar against the Australian dollar, using a 'margin account' via one of the many online brokers. Margin accounts basically allow their clients to borrow many times the amount of their initial investment to try and maximise returns but obviously amplifies their risk.
These high risk retail accounts typically allow initial investment as low as £100, and with a margin leverage account you could probably trade a £10000 position !.
Brynn, as mentioned by Buenchico, if you really want to give it a go you would be best advised to practice with a demo or virtual account which are exactly the same as a live account but funded with pretend money of say £5000.
Probably the most common trading platform used by retail traders who use charts to make trading decisions is Metaquotes MT4 software, available free of charge from most UK brokers. I am not comfortable recommending brokers but looking at the list provided in Buenchico post I would go for the FXPro demo account (FXPro offers negative balance protection and their charts one of the few that are set correctly to show a new trading day as per the US New York closing time - long story)
http://www.fxpro.co.uk/trading/platforms/mt4/desktop Open demo account is near bottom left of page.
Obviously it will take you while to get your head around the software but if you get up and running the best currency pair to trade is the USD/CAD (us dollar against the Canadian dollar) or safer would be the CAD/JPY (Canadian dollar v Japanese Yen) .
Never trade real money until you can consistently make profit for at least six months.