I'm writing my pcs award and I'm having trouble writing a bullet for being BN CDR's driver. Anyone care to help me out?

I just have to say, pretty crappy on your leadership's part that you are having to write your own pcs award.... But from what it sounds, you were more than just a driver, more like executive assistant.

First, kick your NCO in the pants for not doing their job. Then kick THEIR NCO in the pants for not delivering said kick themselves and failing in THEIR job. But that doesn't help you with your actual presented problem, so....

I don't know, I wasn't there. But.... Here is a general bullet format that is exceptionally helpful for starting out...

(Name) performed/served as (action/position) (regularity /scope). (To what standard). This action resulted in (results - make sure you tie results to approving authority mission).

For instance:
(SPC Wyatt) was selected to serve as (the BN Commander's driver) (on frequent occasions). (His performance exceeded expectations and was considered invaluable by the BN CDR.) His service in this capacity (directly enabled the BN CDR to liaise with peers and Senior Commanders in order to secure mission critical resources for current and future missions.) - bonus points if you can name a specific mission, (e.g.Operation Noble Eagle, BN COMMEX, etc.).

The key with ALL award bullets is that you have to show the approving authority how you impacted his/her unit mission. If you are writing a DIV level award, but only have Company level bullets - even if you personally saved the lives of 8 Soldiers in your Company - you will likely be downgraded or disapproved (or sent back for re-write).
As the BN CDR's driver, I am guessing that you are writing a BN-level award (I.e. AAM), so it should be relatively easy to show the CDR who you personally worked for how you impacted his/her mission.

You know what............. SPC, look me up on mil.mail and I'll write it for you. Send me what you have and what you have done, and what your APFT scores were during the duration of time (I wont be able to do this if you are Flagged). I will NOT sign it of course but I'll fill out part III of the DA638. Don't give me personal info like SSN.
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#1) Sounds like a nice situation to be in if you want it (non deployable and not going to the field). I'd focus on the managing the BC's calendar, and scheduling meetings. Also mention (if your billet is for a higher grade) that you succeeded in tasks above your rank.
#2) Pretty weak to have a SPC write their own award. That's set up for failure. Usually there is an unwritten threshold one has to achieve to get awards approved, but that is dependent the chain of command that signs off on said awards. It doesn't matter what is written down on the award. It matters who signs it. But anyway, you really need guidance from your chain as to what the expectation is for each bullet point, how many are needed, and how substantial do they need to be, and how much fluff needs to accompany the verbiage.
#3) Since you are writing it, put yourself in for a Legion of Merit.