Decide if you will be doing the type of climbing that requires fixed protection. In many cases, especially on sport routes you will find protection previously placed. If these bolts are not rusty and are in good standing, then all you will need is to clip a runner to it and clip your rope in. If there is any question about the stability of a bolt or if it moves even a tiny bit when testing it, then consider it merely as back-up protection. If you are setting up new sport routes on uncharted rock, then you will need to buy some bolts, bolt hangers and proper drilling equipment and by all means, learn how to place them correctly.