Even though Raycity is an MMORPG it is of the "lead you by the nose" style, which makes the gameplay perfectly accessible to foreigners who don't really speak Korean. When the game starts up you'll find yourself in a small town area. There will be various NPCs standing around who want to give you quests. You can drive up to one and press enter. When you take a quest it will indicate how to do it in one of two ways. If the target of the quest is another NPC or something like and you're in the same area as them you'll see a big arrow point at them. If it is to do a specific cab mission you'll see markers on the main map telling you the area in which you can find the mission. You can just keep clicking okay and next until you've accepted a quest. Press L to bring up your quest menu and see your listed quests. Choose one and you'll select it as your active quest. If its a mission quest, bring up the map with TAB and you'll often see some quest boxes on the map. These tell you the areas you can go to to find the missions. Drive to those areas and you'll see various fares standing around. Quest ones will be a different color. Grab as many quests as you can and exit the town by driving in to the blue glowing area. The reason you want to grab multiple quests is that you will often have a fare that can satisfy the requirement of more than one quest at once. You might have a simple quest like "Drive 10 women to their destination" which becomes completed while you're doing a quest about picking up a specific individual. As you complete a quest, you'll see faint white words appearing mid-screen, these are updating various quests that you've just satisfied. I've seen a single individual add to the total of 4 different quests at once, so its worth it to drive around and pick up as many as you can. It can get confusing, especially if you decide you want to start clearing them, but it can also save some time. In the map above you'll see a white circle in one of the quest areas. After you leave the town you might want to head towards that one and pick it up. This is a tutorial quest giver who shows you various mission types and other things. She appears to be new as I don't recall her being there before and when I went in game to make some screenshots I hadn't done any of the quests for her. You can do around 12 different quests of various levels and then she'll pass you off to quest giver in the second "town" area. For all its simplicity I've gotten my car to level 57, and my character to level 17 (they're independent as you can change your car and level it separately) and in all that time I've probably been able to complete 99% of the quests without issue simply following this strategy. There is the odd quest that just has no real indication on screen where you are supposed to go. You can abandon it, or if you really want to do it, keep it and you might get lucky. Alternatively you could phone a friend. I don't know exactly how to unlock new areas, but I have. I believe it has to do with levels or perhaps doing specific quests. In the towns you'll also encounter various NPCs providing services. Things like gas, repair, garage, vendors, etc. You can buy new engines for your car and you can buy things to add some style to your car. You can't paint the car unless you want to pay real cash for it. So whatever color car you buy is generally the color you are stuck with. You do get a selection of reasonable solid colors to choose from when you buy a new vehicle.
You will notice that as you do missions some times the patrons will give you what appears to be junk. These are for bingo games. In the towns you'll find vendors who sell bingo cards. You have to place these items on them and try to make lines and trade them in for other items. If you want to complete them, grab a couple and find people who drop the items you need on it, keep doing missions for them and you'll get enough to get the item. You can have up to 10 bingo cards at once, but I find all the junk really starts to clutter the inventory so I prefer to do it as a concentrated effort, selling or trashing the junk when I'm not doing bingo. If you do the tutorial quests you'll understand what you need to get the most reward from a fare, but the jist of it is this: some people like crazy driving (most of them) and there is the odd person who doesn't. If the person cheers when you do something do it more, if the person freaks out, don't do it. The odd person who doesn't like driving prefers that you stay in the proper lane and don't hop over other cars. The people who like crazy things usually like near misses, hopping over cars and driving in the oncoming lane. Here is some gameplay of me on a mission. Not all fares will be upset by things. Most fares get upset if you slam in to buildings or other cars, but some won't care at all, so slam around all you like.
I also wanted to mention that Raycity is actually based on the streets of Seoul. Driving around some places I've seen familiar subway stations and even business fronts that I've passed frequently.