There are a lot of good tuts out there on this general topic, but I'm just adding my input on why you should start out with a basic shape and a few strategies for using this tool to create some cool illustrations.

Using After Effects to put the deflector dish back on the Millennium Falcon in Star Wars: A New Hope
178 views

Installing a catalytic converter shield on a 2nd gen. Tacoma
25 views

An additional OEM skid plate for the 2nd gen. Tacoma - not a radiator splash shield
166 views

Installing an aftermarket skidplate on a 2nd gen. Tacoma
16 views

Installing lower control arm skidplates on your Tacoma
26 views

Trying out a budget skidplate for the 2nd gen. Tacoma
56 views