Ive had a few of my tunes cut, recommendations are: Listen to your track on as many different sound outputs before cutting (car stereo with a good sub is a defo, surround sound system, bedroom setup - an best of all, but not possible for everyone - a soundsystem with bassbins). listen for anything that stands out, is too loud/quiet or doesnt work and go back to the studio.
Send the cutting house a WAV of the the original file, cutting from an mp3 really shows on sound quality, especially after a bit of useage and youve played it a few times.
Dont cut a 33rpm, go for a 45 - the vinyl will be alot louder/cleaner sounding, you can tell this by comparing 33 & 45s of tunes you already own.
As for the comment above about paying pre-mastering before you cut, most places will offer a mastering service included in the cutting cost (vinyl carvers above do, thats who i used im pretty sure).
i still play my Alien Girl RMX i cut over 2 years ago, an it sounds pretty phat. its had well over 100 plays.
hope some of that shizzle helps :thumbsup: