quick summary of how the game is played since there really aren't any in-depth previews or anything for the game (to add on to what slasher_thrasher21 posted earlier)
At the beginning of a level, if you have any survivors in your group, you can equip them with any weapons you have, heal them (using the same food items you find for yourself during gameplay, since there's no recharging health) and send them out on missions to find extra resources. You can also do some inventory management and move things back and forth between what Daryl carries, and what your vehicle carries. For example, you may want to carry more melee weapons and healing items into a level, so you leave all your ranged weapons in the vehicle (or give them to the aforementioned survivors to use). And of course, you (and your vehicle) only have so many slots to carry items.
Then you enter the level and play as Daryl doing the usual fighting walkers, sneaking around, finding resources, talking to NPCs, etc. It is usually beneficial to play stealthily with melee attacks, since guns attract more walkers, and ammo is relatively rare, but that's up to the player. And sometimes it doesn't hurt to just run.
When you complete the level, you get a summary of any new "recruits"/vehicles you found in the level you just played, and whether the survivors you sent out at the beginning found anything...or died, heh. And if you have too many survivors than can fit in your vehicle, you'll have to kick someone out. New vehicles are found in certain levels if you happen to find certain car keys to pick up. Different vehicles have different amounts of passenger and inventory slots.
Then you can go to your map to pick your next destination. After certain levels, your path can "split", where you basically choose to travel to 1 of 2 main levels (always progressing forward, you can't "travel back" to a different level on the same playthrough), with random smaller levels meant for scavenging popping up along the way during the level load. Of course, walkers will always be hanging around, so you can decide if you want to take the risk of searching for stuff in these levels, or just continue to your main destination. Gas is the main resource in the game, as that's what allows you to travel. The 3 travel options described earlier basically determine how frequent the "road events" pop up. So if you are the type to want to gather as much as possible, you'll pick back roads. If you just want to get to the end of the game quickly, you'll pick highways (but this increases your chance of your car breaking down, which forces you into a level to retrieve a part to repair it). If you run out of gas, you are forced into one of the road events mentioned earlier, and you have to find enough gas cans and then return to your vehicle to continue traveling.
The game is intentionally setup so that you can't play all the levels on one playthrough (there are 16 main levels total, while you can only play about 11-12 of them on any single playthrough). You eventually arrive at your next spot, and then you go through this whole process again, and that's your basic game loop, with story stuff mixed in of course.
Also, hold LB and left/right on the analog stick to lean. RB allows you to shove enemies, which can also break you out of a potential grapple if you do it right when a walker is about to grab you. Don't remember if those things were mentioned in a tutorial screen, heh.