These are the things I bought...that I should have bought right off the bat!
60 Degree Live Center
Hightower Compression Die for Ferrules and Joints
Center Drill Set
5 and/of 15 minute epoxy - I use this if I have a little slop with my joint pins/joints
Loctite Gel Super Glue - I use it for tips, ferrules, joints, joint pins...everything!
Sandpaper - 180/220/400/600/800/1000/1500/2000
Soft Scrub - Takes the place of Unique Shaft Cleaner
Mequires Carnuba Car wax - Takes the place of every cue wax out there
Mind you, I'm converting house cues and eventually going to build cues. After I started installing pins, I found I needed a lot more than I had and there was no standard I used so I was all over the place and ended up buying more stuff than I really needed. Hope this helps, feel free to ask me anything.