I agree with anEconomist.
1) 15K on a car?! Are you crazy?! Seriously. Your first year's salary is only $38,000 and you have $90,000 in student loan debt. You need to buy a USED $5000 car MAX. Hell, if it were me I'd find a 10 year old car for $2000. You do NOT have $15,000 laying around which means you will be making payments and likely paying interest on that $15,000 car too, so it will cost more than $15,000 when it's over. Too many of you young graduates tell yourselves that a new car is necessary, and you think that a $15,000 car is reasonable because they are on the low end of new cars. A new graduate with $90,000 in student loans is FOOLISH to buy a $15,000 car. Payments, interst, INSURANCE. FOOLISH. Don't do it. Really. Just because you are a newly minted college graduate with a seemingly decent pay raise coming the next few years, this does not entitle you to a new car. Who knows if you'll like the job anyway. Don't bank on that pay raise until you get it. Cash in hand FIRST and then buy stuff.
2) Married couples should wait at least a year before buying a house. Rent first. The old joke is that you need at least a year to know how close to the inlaws to be. But from a practical standpoint, you need a year to find out what the two of you really like in a home, and you don't make enough to go put yourself into mortgage and buy that car you want -- two bad financial decisions which makes me think that you are likely making other bad decisions too.
3) Don't get sucked into the mortgage is the same as the rent thinking. No it isn't. You'll have condo fees and you'll want to spend money on things for the inside and on and on. Don't do it. I'm telling you, if you rent for a year or even up to three years until you are making $65,000 and your wife is then working, you'll be much better prepared. Are you planning to live in that condo for YEARS? I bet not. So, you want to set yourself up for the hassle of having to sell it in 3-4 years so you can then go buy the bigger single family home that you really want?
Advice time:
1) Rent a one-bedroom apartment or a two-bedroom one if you need office space. Spend no more than 1/4 of your TAKE HOME pay on the rent.
2) Buy a nice used car. I'd spend $5,000 max (again, if it were me, I'd spend $2000; my current car that I drive every day is worth about $1,400, and I make more than you will in the near term). Let's say you drive it for 6 months and it needs an $800 repair. Bummed right? Hell, if you bought that new car, that's about two+ months payments for it. Cars are prisons that people get themselves into willingly. Don't let society fool you into thinking you need a $15,000 car right out of college. You REALLY don't.
3) I would attack that student loan debt with a vengence. Even if it has a ridiculously low rate. Goal for college educated people (unless you spent a ton on graduate school) is to be debt free (except for a house) by age 30. You should figure out how much you need to pay on that student loan each month to get it paid off by the time you are 30. Now, if it has a 2% rate (and really not any higher) and you'd rather take the time to pay that off in 10 years then I don't really have a problem with that, but it'd be more fun to have it gone earlier than 10 years. The borrower is SLAVE to the lender. So, are you your own man or a SLAVE? ALWAYS ask yourself that when you decide you want to borrow money...for a car, on a credit card, on any loan even a house. Some will scream that you can invest your money and make a bigger return than paying off a student loan early. Mathematically that is true, but things don't always work out in your favor like that, and I'm betting your student loan rate is over 5%. With that student loan payment and you wanting to buy a $15,000 car, you REALLY don't have money to buy a condo.
4) Imagine being 30 years old with NO debt. If your wife gets a job making decent money then you can get that student loan paid off even before age 30 -- maybe age 28. How awesome would that be? You WILL NOT be debt free if you buy a condo now and a $15,000 car. YOU buy a $15,000 car and then your wife will want one too. FOOLHARDY.
5) When you are 28 or 30 (whenever the debt is gone) then establish an emergency fund of 3-6 months of expenses, put 15% of your income into retirement accounts (401k and Roth IRAs), start throwing extra money at the house that you might have bought by now (you should have taken only a 15 year fixed rate mortgage on that home). If you're doing all that, then either start saving for your kids college (if you want to) OR open separate mutual funds and start funding those.
You should be able to retire at age 62 with $2 million or more in retirement accounts.