A couple of things come to mind ...
Our club holds a Thursday evening (4 PM 'til dusk) training session. No other flying is permitted. We also (try to) limit flying patterns to "race track". This eliminates the newbies flying with the "hot dogs". The planes are by and large trainers that are fairly slow floaters. The likelihood of mid-airs is reduced significantly.
When training on other days (especially the weekend - our club has over 300 active members) the other fliers are pretty respectful about coming out on the line when a trainee (identified by the buddy box) is in the air.
When I come to the flight line I will watch the other pilot(s) I will announce where I will fly. If they are doing in close patterns & 3D stuff I will fly up and out. If they are maidening / trimming their plane (usually high and in a race track mode) I will announce and fly down and out or down and in. Not something that our club recommends - just seems proper to communicate on the flight line.
Marxoverkill - good luck in your training! Have fun and go to the field with a goal in mind. Boring holes in the sky is cool 'n all but you need skills to keep these wonderful toys in one piece.
Just sign me "decommissioned too many planes: