Solo2 is autocross, your class would be based on what modifications have been done to the car. The rules (slightly outdated) can be found here: www.moutons.org
Since you have no experience, I think you'd be better off not making any adjustments until after you drive at some events so you can know what you want to get out of your setup. Once you are able to say, 'my car does this and I want it to do that,' then it would be easier to give recommendations.

This is assuming you plan to attend enough autocrosses to make it at least a hobby. Otherwise, there's no need to set up the car based on how it would do at an autocross