Firstly, it is important to work out which courses interest you. Course search on the TAFE website contains details on all full-time courses offered at TAFE colleges. If you are still not sure which courses to apply for, see your school careers advisor, the Career Centre or a TAFE college information centre for more information.
You should apply for more than one level of a course if there is any doubt about your competitiveness. For instance, if you wish to apply for the Diploma of Business it is a good idea to also apply for a similar course at a lower level such as the Certificate II in Business. Aim high, but be realistic.