Just started working with sculpey, any tips?

[Hoverboots]

Are there any modeling tools I should have? Like, special rollers, knives, etc?

 

[rollerboi]

Anything can be used as a sculpting tool, if it gets you the desired look. I recommend you head over to ConceptArts forum and read up on some of the maquette building and tool tips there.

3D, SCULPTURE & TOYS - ConceptArt.org Forums

 

[Nyrath]

And be careful, if it gets burnt, the stuff is toxic.
I'd advise getting a toaster oven dedicated to baking Sculpy, don't bake it in something you are later going to use to make your dinner.

 

[Psycho Sideshow]

Small pasta rollers help to break through the initial hardness yet I don't use mine much on small models.