Buy the cheapest set you can find, wilson makes a good starter set. Once you can hit those then consider stepping up to a better set. Get a set with stiff shafts if you are younger or a flex shaft if you are older, graphite or steel makes no difference. Make sure the shaft is long enough so that your grip is in the upper middle part of the grips (handle area). Club heads are designed differently but all have about the same club face, so when you are looking down which one gives you the greatest confidence that you will hit the ball (perception is greater than reality in this case).
If you have a good swing you will hit anything well, the technology of clubs will make a small difference in the score.