Yeah, you will still make some mistakes. Don't worry you won't be the first or last. One thing to remember is you reap what you sow. So be willing to do the work up front.

Mow them with your bush hog. You don't want to cut it lower than 6". And try to mow them right before it rain will help to.

You can plant all this together. Just work the ground and spread and cultipack. The only thing to no about the differences in the clovers is the whites are true perrenials, and the reds and yellow are normally bi-enials. Though they will reseed.