What guitar picks should I get?

Recommendations with Links:
Dunlop Celluloid Medium - Great general purpose

Dunlop Celluloid Heavy - Great if you want a thicker pick

Dunlop Variety Pack - for electric guitar

Dunlop Jazz III Tortex 1.14mm

Thick picks are generally more precise, stiff, and have a fatter tone. And are better for technical guitar playing. Medium and thin, floppy picks are good for strumming.

Picks come in different materials, which all sound and feel different. Some of the popular ones are celluloid, tortex, delrin, nylon, ultex, etc. These all feel and sound different so try a few and see what works for you.

A lot of players use jazz III picks which are great for precision, but may not be as comfortable for most people due to the small size.

Some picks have grips on them, in the form of either text, holes in them, or rough surfaces. A lot of players love this as their hands get slippery. I find them to be useless personally, but whatever works for you.

Lastly, for those more advanced players, gear addicts, and rabbit hole explorers here's a list of different pick companies that I've tried out:
D'Andrea, PickBoy, Graph Tech, Blue Chip, Red Bear, Fender, Dunlop, V-Picks

For specialty stock try String By Mail or one of those more specialized sites.