+1 You are on the right track. Read the Detailing 101 sticky on this forum, too. Do you have a bucket? It looks like that's not part of the DI starter kit. Look for a 5-gallon bucket from Autozone, PEP Boys, etc. Don't re-use some old bucket you've been mopping the floor with. Actually, buy two buckets. You'll need two. Get a spray nozzle for your hose, too.
Best of luck. This is an addictive hobby.