Thats alright we have all been there before,youwill learn a lot as you go with this new project, just take your time and think everything through before you do anything, it is always better to ask than to give it a shot in the dark and cause an avoidable problem that will cost you time and $'s, theres many great giys on here that can give you all the how to instructions you will need, but remember to search the forum and most of the time you will find the info. you need right here, I'm sure you will never run into a problem or have a question that cant be answered in this great place by people who want you to get it right and will help you get it done.
So, get the clutch lever mounted on the handle bars and then run your cable and get it attached properly going through the cable retaning assembly that is under the carb. then slide the twisted steel cable itself through the hole in the the clutch operating arm and then rotate the arm in toward the cable and install the brass cable stop by putting the cable through the hole that is in it and then have everything in a position to where there is not any slack in the cable and now tighten up the screw on the cable stop in that position, now when you pull the clutch lever on the handle bars back your clutch should release and the bike should roll freely. see what you can do with all that, I hope I explained it all to where it is easily understood, it's kinda hard to put it into words on here sometime.