I think the first thing you should do, is a trial flight lesson, so that you can see if you like or not!!!
Then there is twop routes you can take;
-Modular
-Integrated
-Modular= cheaper, but taakes longer. You would be doing the course in modules: Private Pilots Lic. ( £5000 ), Then theory course for the exams ( £2000), Hour building £10000 ), Commercial Pilots Lic. ( £5000 ), Instrument Rating (£12000 ), and all skills tewsts on top, so its about £27000 - £30000
-Integrated = Expensive, but tends to be quicker, Like the name says, and Im guessing its about twice the price of modular!