Heya Arcanel!
The way I've been handling the slots is in waves. I take in three requests then once I finish those, I take three more. I pretty much go in order of those who posted requests so there's a few people in line after this wave.
If you post your request now, it basically secures you a spot in a future wave.
I apologize, but this is in the original post:
"I will not accept requests with multiple characters (one pony per request). If you have multiple OCs, pick ONE."