Don’t let the specter of grinding your own beans intimidate you. Sure, there are a ton of grinders to choose from, and you do need to have some idea about what type of grind works well with different styles of coffee brewing (i.e. drip, french press, espresso, etc.), but you don’t have to be an expert. Here is some basic info to get you started.
There are 2 types: blade grinders, & burr grinders. Blade grinders use a rotating blade to grind beans, & usually cost around $15-25. Their main drawback is that they don’t provide a very even grind, and the heat generated by the spinning blade can create a slight “burn effect” on the coffee (and I do mean slight. I’ve used a blade grinder many times and this has never been an issue for me).
Burr grinders use a metal plate to grind coffee, resulting in a more uniform grind and producing less of that flavor-stealing heat than blade grinders. Their main drawback is the price. A high quality burr grinder can cost upwards of one-hundred dollars, although some companies are now making burr grinders in the $40-50 range.
If you mainly brew drip coffee (i.e. the standard household coffee maker: filter, water, coffee, press start), and you don’t want to spend much money, a blade grinder can get the job done (hey, you can always upgrade later if you notice a “burn effect” from the blade). But, if you use a french press, or like to make espresso, you’re going to need a more uniform grind than a blade grinder can provide. Luckily, there are tons of places online where you can browse grinders, read reviews, & decide what’s best for you.
You may also be interested in these other resources: buying a grinder, making espresso, & using a french press. (I realize that the french press bit is from a “wiki” website, meaning anybody can edit it. But in this case, I think the information is absolutely reliable).