So I finally quit tuba. I was stuck with it for this past year. Now I'm finally gonna audition for drumline next year. Specifically, I would love to play bass. I am great with counting and I'm even practicing some snare rudiments. Is there anything specific I should work on to prepare to play bass?

You should really work on endurance. I find myself getting tired faster than i do when playing snare/tenor

As with any percussion instrument, practice with a metronome. Learn what the proper technique your drumline uses for holding a stick/striking the drum.

Being able to properly count and subdivide is, in my opinion, the most important thing for a bass drummer to know. I'd much rather teach someone who already knows how to count and subdivide to play a drum than to teach some grade school "drummers" how to count/play in time.

Using a metronome, work on properly interpreting each subpart of a measure of sixteenth notes. For example, develop a feel for where all of the downbeats fall, the e's, the &'s, and the a's. Practice playing just the e's, practice playing all the a's, etc. Then mix it up, play all the e's and a's, play all the downbeats and e's, the downbeats and a's, the &'s and a's. I think you get the idea. If you develop a proper feel for where each subpart of a sixteenth note falls in isolation or with one or two other subparts, you can pretty much play anything. Apply this same method to triplets, sextuplets, etc.

Also, if you can find another person willing to practice with you, work on learning a split part, even if it's as simple as alternating eighth notes or one person playing 1e and the next playing &a back and forth. This will help you develop a feel for playing split parts and listening to the others.

Thank you for the advice. I'm gonna give it a try.

You should also learn how to play into your feet which can help you subdivide. Then theres always presentation you need to know. You might be taught that at rookie camp if you have that at your school.It's basicly the way you hold your sticks at attention and where your head is facing while marching.

Matched grip. Quite simply, that is all that bass drum happens to be.

-Counting
-Subdividing
-Matched grip on drums mounted sideways
-Adjustment using a small bass mallet to a hamster stuck onto a stick. (Depending on the size of drum)

Your PAS 40 will suffice your basic hands, it'll take just a little while to get used to not seeing your feet, and you'll figure out the positions of your arms when you get on the drum. The rest is really listening, counting, and marching! They all build up with practice, so just keep working as much as you can.
Happy drumming, and YEAH BASS!

If at all possible practice on a bass drum or at least a bass drum pad. Learning to fight gravity with your stroke is one of the toughest aspects of Bass drum. The fatigue of playing always fighting gravity gets many of my rookie players.

I would recommend picking up Bass Logic. It's a great learning tool.