Welcome to MR, Ubikzz !
There is a lot of SF (SyFy or Sci Fi -- lots of ways to type it, I've noticed) out there. Have you visited
Baen's WebScription site ? They have a great
free library at baen's.
Also please check out all the free ebooks right here on MR that have been beautifully hand crafted by some very dedicated MR members. (look up on the left in the blue bar -- choose ePub and LRF).
Have fun exploring the forums and just ask if you would like to know something.