Xeno. screw weighted chins for now. don't add weight until you can get 5x10 bodyweight chins. the key to getting better is frequency. do chin-ups and their variations like 3-4x a week. one day can be chin-ups, another day can be neutral-grip [close or wide] chins, another can be pull-ups, you get the idea. you can either shoot for a total number of reps (starting with 30 or 40, working your way up and up), or just do 5 solid sets of reps with good form.
Also - let's say you are doing 5 sets and however many reps. on the first 4 sets, avoid going to failure, leave something in the tank... the last set, it is ok to go to failure as long as that last rep isn't a grinding-gay-ass-rep.