I'm sure you will be fine.
I run an agility club and when we hold beginner courses we don't expect that the owners or dogs will know anything... so don't worry!!!!!!!
As long as you have decent basic obedience you will be FINE!!!!!!!!
The only thing I find with training cockers (workers mainly) is that it is better not to stick to one reward e.g food or one toy e.g ball - their attention span is soooooooooooooooo short
- a mix of everthing keeps them focussed - but it will depend on your little angel - you will know what's best as a reward.
we get our beginners to teach their dog a 'go on' command, a touch command and left and right - as well as building up their confidence on each piece of equipment. But it depends on the course your trainer is running. I can pm you the steps for the above commands if you want - happy to help - but it maybe worth seeing what your trainer is going to teach you - and then practice those commands in between sessions (if you can).
Cockers always enjoy it - and I'm sure you will be great too!!!!!!
Keep us all posted