How do i get an rrsp and rdsp and how does it work? I believe my deduction is about 126 or 186.00 total according to my taxes for the deduction limit?

Ive been seriously thinking about investment for the first time ever. Ive heard of rdsp for people on disability and, of course, rrsp and gic's.. my deduction limit is under 200.00 i believe an d so, i havent a clue how to get the rrsp, what i can put into it or how to get an rdsp and what to put into it. I want to put away as much as possible for retirement even though i am on odsp. Please help?