Great advice from previous posts! Buying (& using) router bits can become costly and confusing, but IMO the top first five bits to consider are a 1/2" straight bit, flush trim bit, 1/4" round over bit, a chamfer bit, and a rabbeting bit. Five more are a dovetail bit, a pattern bit, cove bit, ogee bit, and a slot-cutting bit. A bit with a 1/4" shank is less $, but a 1/2" shank gives a stronger steadier cut especially in heavy or deep cuts. Buy "name brands" where possible, but trying a "lesser quality" for a few special cuts is better than investing in a big box of bits - most of which you may never use. Be safe.