Newbie, SWMO, 70 chevy, 72 GMC

[wrapumup]

Just introducing myself and glad to have a forumn out here. I am sure I will gain some usefuly knowledge and will gladly give some, although at this point that seems unlikely I just purchased both of these and they both need some work. I will have plently of questions later, but if you could direct me one right now would be, how do I replace, not even sure what to call them, the window channels? I am not a body man so don't even know yet how much you can get to by taking the inside panel off the door. Any clubs ro anything in my area that anyone knows about? Thanks!