Questions About CISSP and OSCP, the Study Materials Required and More??

First of all I like to say that English isn't my native language , so if you notice any grammatical error please bare with me............. I'm a Computer Science Engineering student who is interested in security. I was thinking of doing OSCP course by offensive security but a friend recommended that I do CISSP first. The question now is how much time and basic knowledge do I require for both CISSP and OSCP?

I know C,C++ and some basic python and bash. I've been playing around with linux lately.

Can you please tell me the time required for studying CISSP and then OSCP??(I'm doing these courses along with the university courses and projects)

If CISSP is required can you recommend me a website that provides both the training and certification?? And can you guys also recommend me some study materials for both CISSP and OSCP. Any help and suggestions provided will greatly be appreciated.