Just starting out. Is Creator the right choice?

I'm just starting a new project. Its a (minority) sports results system, where members of the sport can input their results and see how they compare to other members. Stats need to be run on the whole results list. Simple database stuff, but with a few thousand end users. What would the cost be? I also want it interactive so people can put their own personal goals in and training plans and have the app return achievement awards. I want the users to link to their trainers and and so the trainers get rewards when their students acheive their goals etc. and for these networks to be visible to other users.

I'm a technical beginner so am I being too ambitious? Is my project doeable? How would I start with Zoho? Would I do this in just Creator or use other Zoho applications too?