Start here:
http://www.rc-mini.net/joomla/index....d=44&Itemid=60
It's very important to get the shock build right.
Tyres are also very important, check around the local track to see what others are using.
After that not really much, untill you break stuff.
If you break any of the knuckles you may want to upgrade to alloy, but only get the genuine tamiya or the new 3racing knuckles (the old 3racing knuckles are not very strong).
Shocks with adjustable collars are handy. 3racing have a new range out which are pretty affordable and i reckon pretty good. With the new shocks get some of the SHORT tamiya on-road springs.
Most people like to run universals, i prefer the tamiya ones but they are more expensive. Some of the other ranges are quite soft.
The rear axle stubs can be quite soft and bend. If you end up upgrading to universals take the axle stubs from the front and use them in the rear. They dont look the same but will fit and are a LOT stronger.
But most of that is a wish list, you should be able to at least get started with the car as is. And if its handling ok get used to running the mini as is then start upgrading as your budget and ego allows!