82 chevy stepside

I need help and tips I bought my first 4x4 truck it's an 86 chevy stepside 4x4 I have no clew bout lift kits or body lifts. Right now the truck has 33x12.50-15 tires on it an I think jus a leaf spring lift on it , I wanted to maybe pick it up a little bit an see if I could put 35x14.50-15 with out making any drastic changes or what would I need to do to make that possible , also how much of a lift , if someone could please help me out, i have no experience in this at all only thing I know right now is a love my chevy and I wanna go with the pitbull rockers as far as tires inless someone has a better suggestion , thank u for your time and patience.. Sorry bout putting 82 on the subject it's an 86 whoops