My suggestion is that you don't go full out with advertising initially. It is best to start small, gather play feedback and improve slowly until you believe the server is in a condition that you'd like everyone to see. Remember the saying measure twice and cut once? That applies to Minecraft servers. I can't imagine how over whelming it would be to grow from 0 players to 300 within a day, it just seems irrational to do so. Best of luck.