Underage? Not a problem.
You've got the money.
First find a shady dude near the Pavlovsk train station and buy the necessary papers. Then you can even work in the fashion business or shoot porn films.
And of course own a car.
There's plenty of them to buy at the car dealership in the industrial district. The most expensive is a Ferrari for 10 million rubles.
The repairs alone cost 200 000 easily.
Of course don't forget to buy gas.
Next the property. There are several properties to buy in the game. The cheapest is the dacha, I guess. You can renovate it and it has a garden. You'll need a car. Then there's a small house in the suburbs. No renovations needed as it's new. Don't remember if it has a metro station nearby. Then we have an old apartment in the residential district. Needs renovation though. Which can exceed the price of the apartment itself. Has a balcony. You can walk to other parts of the city but metro is a better option. But if you bought the car already, transportation shouldn't be an issue no matter the location of your property. I think you can rent out the apartment if you aren't using it. And the apartment can be sold. Finally we have the villa in the rich part of the city. Not long ago there was a metro station build there, so even if you don't own a car it shouldn't be a problem. I think you could even walk to the old town, if this hasn't been changed in the new updates. If you go for the villa, you buy the land first. Then you choose which part you want to build next. You can even build a sauna, pool or gym. It even has a nursery and a library. Basically you have a separate room for every activity you were doing in your apartment.
Be warned though, it's an expensive project and the final cost goes into millions of rubles.
I think the building costs were around 5 mil. plus the land so around 7 mil. rubles altogether. But don't quote me on it. It was a
long time ago.
P. S.
There are options in the cheat menu to add papers. If you don't find the dealer. School diplomas are available too in the cheat menu.