The best way is to not store it and play with it 24/7...if only
Get a quality case, and try your hardest to keep it upright as much as you can. Failing that flat. Try to avoid leaning the cue up against something at an angle either by its self or in a case.
I have a wall rack that my brother in law built for me years back. I've got about 15 cues or so on it that don't get touched by anyone other than guests that come and play and it does a pretty good job. Only time will tell if you've stored a cue correctly.
Very high quality cue, airtight box, zero humidity, constant ideal temperature (not even 1 degree changes), cue never leaves box or exposed to any outside elements. It's really that simple. Good luck.
For long term storage I believe a shaft should be stored as vertical as possible in a gun safe with a dehumidifier. That is safe and secure storage. As vertical as possible in a dry place for short term storage. I also believe an aged, well sealed shaft with 3 coats of a premium buffed in wood wax helps with protection. On exposed wooden shaft joints, such as the one on my Radial Pin joints, I give the wooden shaft hole a couple of coats of wax every 6 months and use a joint protector to aid in keeping moisture out. A friend of mine said his old 314 Predator shaft warped from leaving it horizontal in a hot car for to long. Ya got me.
Very high quality cue, airtight box, zero humidity, constant ideal temperature (not even 1 degree changes), cue never leaves box or exposed to any outside elements. It's really that simple. Good luck.
A friend recommended using silica packets which he tapes under the lid of cue cases to absorb moisture as an extra precaution. He said after a while he'll nuke the packets in a microwave and re-use.
I am no expert on this, but it sounds like a good idea.