Whilst Ernie is still very young there are tricks & games that you can start to teach him in readiness for basic agility foundation.
Clicker is very good to get your dog to think what you want to offer you a behaviour so you could start teaching going round a cone but put a directional command to it so he learns left & right you can use clicker or toys for this.
Teaching control of their legs is good so teaching them to stand on a box or step front feet on then try teaching back feet on step then all four feet, make challenge harder by making step or box smaller.
Wobble cushions are good do same sort of thing with them.
Cardboard boxes cut sides down & teach him to step in & out you can shape this to be 2 front feet out back feet in this can be used towards contact training.
Ball games are good ask for a sit or someone hold him you run out & call him with your toy get him to turn into you when you stop this helps teach the dog to de accelerate. You can do the opposite & send a toy out in front & send him with you running so he runs past you .
There is loads of very basic games & tricks that work towards agility that can be taught now as they are not load bearing but build focus,drive & control.
Some good web sites are about but most you have to pay for
www.agilitysecrets.co.uk with Laura Chudley is very good