Fairly new back to Magic and drafting in particular, but I've done alright in DOM draft so far.
Two 7-2 runs, both with Wizards. If you can land an Adeliz or some Wizard's Lightnings, forcing Wizards tends to work. The bots always pass the Wizards since most of them are underwhelming until you start stacking them. I played 3 Lava Runner and 3 Ghitu Journeymage in my 7-2 run today. With Adeliz and Naban they did work. Also, there's so many cheap instants to pump your team/make them evasive that things can get out of control quickly. Like people here have mentioned, the format (seems) slow and people get stacked up with 5 mana stuff in my experience. If you can run them over....
My 0-3 run was when I tried to have some fun and make a Muldrotha/Tatyova Sultai deck work. I know some folks have suggested going three colors, but the online shuffler has a habit of bending you over, so if you do go that route I hope you picked up some mana fixing like Grow From Ashes. Any deck trying to get cute with three colors is going to have to fend off the faster Wizard decks and the strong mid-game decks from BW. So you're going to need some good removal and some luck.
Just general thoughts on DOM:
Fliers are beastly here. Academy Drake, Pegasus, Adeliz, several big dragons, black demon flying guy that makes opponent discard, Tempest Djinns, Sphynx, Shalai, Lyra, etc. If you're in Green, main deck a Pierce the Sky.
Stay away from Legendary Sorceries. A couple are actually good, but you have to have a Legendary creature on the battlefield to cast them.
Removal is key. I guess that's always true for draft, but especially in DOM where there are so many bombs out there that are just huge. Your opponent has Shalai or Lyra? Good luck winning if you don't have an answer from hand.
Like above, the entire format kinda revolves around these nutty bombs. You need to have some in your deck. Most games play out where both folks play some boring crap, the board gets gummed up a bit, and then someone spikes some ultra-high level card that wins them the game if it can't be answered. The games I lose that aren't to mana flood/screw happen because of this.
Kicker is the real deal, but you need to pay attention to what it does to your mana curve. Skin-Witch is an ok blocker at 1/3 on 2. At 6 she's amazing by dumping your opponent's cards. Getting two Saprolings is nice, but getting four is outstanding. The flexibility really does help.
U/R Wizards, B/G Saprolings, B/W Knights, Mono B w/ Splash for good stuff seem to be the easiest/best working archetypes, at least for me.
If you want to get better at drafting, watch people do it. LegenVD on Twitch drafts every day and really explains his picks, in game decisions. He's helped me a ton. Read LSV's set reviews. Watch LSV and other great Magic pros draft DOM on YouTube @ ChannelFireball.
Good Luck!