Hello to everyone!

I'm pretty new to gardening but have been given the task at work to raise about 2000 plants for next summer in a heated poly tunnel.
The site is a coal fired coastal power station on the North-East coast.
We have a big problem with rabbits so I thought growing something like pelargoniums or/and Begonia from seed.
Do I stand a chance as a newbie!? I have grown my own plants before at home in unheated greenhouses,but I've never took on the task on a scale like this before.I'd be most grateful for any hints tips advice that anyone can give me.
which pelargonium type would give the easist/biggest success rate for plants per seed? how many seeds would I need to raise about 1500-2000 plants?

thanks!
steven.