Yahoo makes a draft order approx 7:30 tonight.
After 7:30, go to your team page and you'll see a link to get into the online draft room. I think you can figure it out from there, Yahoo tweaks the app every year so I'm not sure what it'll look like for 2016.
Usually Yahoo lets you add players to a selection queue and you just click on the top name when it's your turn. There's a master list that you can sort by position to work from.
I usually pre rank approx 200 players and work off my own custom list, but I suck.
Some people just let Yahoo draft for them. You get great starters, but lousy back-ups.