How to prepare enough material for my class? I have recently been admitted to teach some TOEFL courses in an institute and the course I lecture is reading and writing. According to the institute policy, each teacher is free to have his/her own material of teaching. 
I am spending a lot of time observing classes and I prepare powerpoints to present in my class which takes a long time to prepare them every session. The students have been pleased so far but in one of the classes another instructor has given the students 7 gigabyte of additional material and also sends them about 10 sample writings each session and all in all has a wealth of teaching stuff to give to the students. They  have about 3 years experience teaching TOEFL.

I am new but I know I am doing my best. However, I feel bad for my students to be deprived of the material that other students have the privilege to have just because their teacher is someone else.

The other instructor does not share his material with anyone and it is of no use to ask him. I would appreciate if someone let me know how I can compensate for my students and if you know any good sources of TOEFL writing samples please let me know.
It is a common misconception among beginning teachers (including me when I first started) and some experienced teachers that it is good to include more materials in your teaching.  However, since students have a limited ability to learn, it is better to keep the quantity of material within that limit.  Pick the most important stuff, and make it really good.  Then review as much as possible to help students remember.  

When designing your teaching methods, start with objectives (e.g. improving students' TOEFL score), then pick your assessment (the TOEFL), then design the content (practicing things that are likely to be on the TOEFL).

When I teach, my challenge is getting rid of unimportant material so it does not distract students from the important information.