Needing help with grooming my dog.

Have a part sheep dog part poodle and I not sure what clippers to get so I can shave him and then start brushing regularly.

Was thinking the –

Andis 24675 UltraEdge 2-Speed Detachable Blade Pet/Dog Clipper – Runs Cool & Quiet, Designed with Two-Speed Rotary Motor & Shatter-Proof Housing – For All Coats & Breeds – 120 Volts, Black

And what blades I am supposed to use with it. He does have mats