Got a bunch of answers already so I'll keep this short. Well, not the first answer,
but the rest of them.
• Playing cue: most of how a cue plays is in the shaft, the half above the joint.
If you don't care about looks, focus on the shaft.
There are 2 major categories of shaft. "Low-deflection" and "standard".
The difference between them is how they affect the cue ball when you apply sidespin.
If you hit the cue ball on the left, it doesn't quite go perfectly straight where you aimed.
It deflects a hair to the right (or vice versa, with right english).
LD shafts are built to minimize this deflection so it travels straighter.
Some people love 'em and some hate 'em. Some pros use them and some don't.
Some even say they're all marketing hype. I think they're great, and they work as advertised.
It takes five minutes to test for yourself.
If I could go back in time and buy my first cue again, I'd get an LD shaft with it.
IMO, since the butt hardly matters, you can screw an LD shaft onto any cheap cue,
and you will have a stick that is just as good as what the pros use.
You still need your cue to meet a bare minimum standard of quality.
$50 sticks might not cut it.
Plenty of $200 cues do though. And an LD shaft (just the shaft, not the whole stick) is $200.
So for maybe $400 or less you can have a stick that plays as well as anything in the world.
For the expensive sticks, you're paying for the name brand and artwork,
there's no 1000-dollar cue technology that makes you shoot better.
• Break/jump cue: Jump cue is absolutely necessary to jump effectively.
Jumping with a full sized cue is 10x harder. The main secret is they are shorter,
and have a rock-hard tip. The harder the tip, the easier it is to get airborne.
If you don't get a jump cue, you are handicapping yourself so much that you might as well
not jump at all. But most pros and semipros jump, and use a jump cue to do it.
A combination break/jump makes sense and will save you money and it will save space in your case.
I think break cues are great but many players (including pros) break with their playing cue.
If you decide to get a jump cue anyway, you might as well get the jump/break combo
so you at least have the option.
• Cue length: just start with the standard length.
• Chalk: Plain master is fine, don't overthink this.
• Glove: Ditto. Get any $10 nylon glove. The $50 gloves are overkill and actually less comfortable.
• Joint protector: unnecessary, a good case will protect it. Maybe use 'em if your cue is worth thousands.
• Tip tools: nice to have, but you can usually just borrow someone else's.
• Special cloths: I personally have it cleaned by a guy with a lathe, gives it the full treatment for a low price.
Only need to do this every other month. If you wanna save money get micro-grit sandpaper to clean,
cue silk to seal and sort of 'lubricate' the shaft, and plain paper towels to wipe off excess.
• Ozone is awesome! Used them for many things with great results and customer service.
Price-wise, almost all the sites are the same for most products. To save money on the cue,
talk to a dealer. A predator dealer can get you a predator shaft cheaper, for example.