I personally would invest in something different first, Maby a non turbo skyline, For you first car, For starters you insurance will be around $3000 if not more. If you can get insured not having any insurance before.
And the fact that a skyline is a performance car is not a good idea for people still learning how to drive. I’m saying this because I know of 5 cases where people who have just got their licences and people who have had them for a while, Have got them selves a turbo car, And crashed it with in 1 week of owning it. We have had one young guy crash his 180sx turbo with in 1hr of owning it.
Also the matinance is high on some vehicles, since they come from Japan you don't know whats going to go wrong with them. My car is a good example I purchased a skyline had it for 2 weeks and the engine blew up, I'm still in the process of re-building it now and have been with out a car for over a year and paying of a $30,000 loan for something that’s sitting in a garage.
Just a few things to keep in mind.
Wait a little while first and then make a move in a couple of years.
My 2c worth