You can start mining after your first plot file right away, if you've set the reward assignment to the chosen pool. For Linux I think you can use
https://github.com/alter3d/creepMiner. I've sent you a PM for some starting BURST.
Just PM'd you!
I downloaded and compiled the miner. It's waiting for first plot file, it will be ready in 13 hours

But once that's done, I can start mining

I've tried to register my reward assignment on
50-50-pool.burst.cryptoguru.org, but I got an error. I guess I need 1 BURST in order to do that. Let me know once you send it

EDIT: I've got it now
Tx ID Just signed my reward assignment with the pool. Not long from now and I can start mine:) Thank you!