Avlis is still going strong and is in no danger of imploding any time soon.
My tip would be to understand the rules for the world you intend to play on before logging in, and get a good feel for the world information as well. A common mistake is to make a character on Avlis claiming it's from some other D&D setting that's not even linked in CoPaP. A quick read of Avlis' world information would reveal that it is it's own world, and that characters created on it are expected to be native to that world.
Another, more common, mistake is choosing a deity that isn't a part of the world you're playing on.
If Avlis is the server you intend to play on, you should start with
Avlis Player Guide.
"A wise man does not dwell on his past. He learns from it, he grows from it, and then moves ahead into his future." -me