Hello all, I'm new to Mikrotik, and love using it.

But I'm having a problem figuring out what to do. My network topology is pretty simple:

LAN <---> Mikrotik <---> Big bad Internet

I need to limit all hosts on the LAN to use maximum 500kpbs of upload, but if upload is idle, than to use as much as they can. I presume I have to go with queues but I'm not certain if and how. Could you help me a bit, just to point me in the right direction? Thanks.