The best way to preserve your collection is to buy the best phonograph possible.
This won’t be cheap, good record decks are the result of expensive ultra high precision engineering and production.
Cheap players ruin records by subjecting the record groove to excessive and incorrect forces from the stylus. The stylus is slamming into the sides of the groove. The groove as well as the music is then mutilated.
A good record deck’s platter is held as rigidly as possible in relation to the tonearm and with as little friction as possible. This costly accuracy insures minimal wear and the best possible distortion free sound.
Fortunately, the technologies and innovations that produce superior sound also insure reduced wear.
Another positive effect of running quality hardware is that used records in questionable condition become more listenable. That poorly treated gem you got at that garage sale for 50 cents has now become a pleasure to hear.
If you must skimp on hardware to save money do it as far away from the platter as possible in this order: speakers, wiring, amplifier, preamp, tonearm, stylus cartridge. (the finest speakers cannot improve on a poor source but good sound from a good player will be listenable on not so good speakers.
I reccomend this product http://www.linn.co.uk/music_systems_turntables get one used for between 2 and 3k. It is fully upgradeable and the sound quality has to be experienced to be believed.
Store your records upright, not packed to tight, in a cool dry place. Friction free innersleeves are available.
Dont use cleaning devices or products. Brushes force surface dust into the groove. Wet cleaning produces bubbles that make noise when they dry on the record.
The stylus will clean the groove as the record plays. Use stylus cleaning paper to remove dust and loose vinyl buildup from the stylus.
A dirty stylus will damage the groove as will a worn one, replace as needed.
Make sure the tonearms tracking weight is correct, you don’t want the needle pushing into the delicate groove more than needed.
Happy listening.