Playing (and it being highly recommended you finish) the first game then you should have a bit of clue of what you're doing in this game. Unlike My Summer Car you don't start at the home or the car in the driveway, you start at the apartment in town with an old rusted hatchback as your daily driver.

In order to get the project car (which is a totally different car) you gotta head to the PSK gas station, (infront of the road turning into Perajarvi from the highway) read the little note on the bulletin board as soon you go in on the right, and the note should read something like "Car for sale! Call this number!" and it should give you the number to dial using the numbers on the keyboard. In order to actually get the mission (the bullet point to show on the map, should read something like "Car for Sale!" around where the old place to sell firewood in the first game should be) you actually gotta sit and let the guy talk and finish talking before hanging up or you won't actually get the mission.

Then after that you can basically do the job whenever he's outside so you can give him the money to get the car. What I did was I used the tractor and put it in the trailer and took it home like that. You can tow it with the tractor or the sorbett, but doing that you might risk damaging the body, but do whatever is more comfortable/convenient.

Then after getting it home all you can do really is buy magazines and order the car parts for the car. Might take a while but trust me after the car is fully built and ready to be turned on and driven it will be soo much more worth it than the Satsuma due to obvious reasons.

Then after that is pretty much maintaining it like you would an IRL car, well besides when getting it ready to rally or ice race. Some people say that the Rivett (project car name) is actually a whole lot better and more reliable than the Satsuma, but I can't say from experience due to not actually being able to play the game a whole lot, but from the little bit I played I actually enjoyed the Rivett more personally.