I do agility with buster, he loves it he can be going bonkers one minute but the second we get on the course he suddenly focusses and does it perfect....the minute we finish he goes back to the bonkers state lol.

When we first started i set up a few practice jumps etc in the spare room... got some bits of conduit for jumps, a couple of chairs back to back with a sheet over it to simulate a tunnel. But thats cos i dont have a very big garden. I know of people that have home made mini courses in their back garden at low cost! Or if you have the money to, and a good size garden you can buy practice agilty kit from places online.

when i was trainin buster i would concentrate on one or two bits at a time, with command, then started chaining them together once he was familiar with the commands (i.e jump - tunnel - weave)

Also, i heard you shouldnt start before one due to stress on joints etc. but i do know of dogs that have started younger, buster was about 18months when we started so wouldnt like to say one way or the other.