As an absolute minimum I recommend buying a grinder - before you buy any other piece of kit.
A good grinder will allow you to grind roasted wholebean coffee for a number of brewing methods, from Aeropress to Filter to a full on espresso machine.
[B]Burr vs Blade[/B]
Forget the latter and buy a decent burr grinder.
Burr grinders crush the beans to an even grind size, whereas blade grinders smash the beans, causing a very uneven grind, with some particles...