Hi not sure what level of experience you have but an RYA course with a school that have a good range of boats is always a good idea. A good instructor who has a lot of experience with a range of boats should be able to help you with some advice and you can alway check what they say on this forum. If you ar egoing to be spending several thousand on a boat I think that the best place to start is to get some good hands on experience using other peoples boats.
an RYA pb 2 course can cost any where between £100 and £500 so have a good luck around. If you have more experience take the advanced course. Saftey and knowlege are the key to good confident fun in boats.