In order to start your preparation for TOFEL you should be aware of the format of the exam.

You should start reading to practice for reading section.  Read some passages and answer questions related to them.

Work on your vocabulary. You should also practice to listen the English .Speak in english language to others.

Work on your time management. Solve as many as practice papers for your preparation and to analyse your preparation level at regular interval of time.

Good luck!!