Welcome to the world of DSM's! You'll notice that there is a TON of online help and the entire community is very nice and helpful! So far, it looks like you've got the right idea about how to go about modding the car. MAINTENANCE FIRST! Timing belt, water pump, etc. before you do ANY modding. Check out this website for a good upgrade path!
http://www.dsmtuners.com/tuning-guide/1gturbo/ Their forums are also an EXCELLENT source of more technical and advanced information! Have fun and happy boosting!