Everything? Man, everything is a lot.
Let's see: first, I would want to make sure that the property is an attractive investment an and of itself (meaning, when you move out it's still a property worth owning as an investment).
I don't know where you're at, but let's assume if the 2bdrms rent for 1200, your 1 bdrm rents for 900 (also, kudos on taking the smallest unit -- that's baller right there).
So, GRM is 4500 on a sale price of 430k (is that a reasonable price? Get a good realtor to pull comps and make sure -- remembering that you make your money on a deal when you buy it).
That's a 1% property, which is maybe good where you live, and maybe not. But let's assume that's ok.
You put 3.5% down on an FHA loan (does the property qualify for that type of loan? It'll usually say on the listing if so), which is ~15k, plus the MIP required with an FHA loan, plus maybe some closing costs, so you're out of pocket let's say 20k at closing.
You finance 415k (430 - your downpayment) at 4.25% for 30 years, so debt service is $2041/month
The 50% rule says you'll spend half of your monthly gross income on non-debt service expenses (taxes, maintenance, vacancy, management, capex, marketing, etc). If the building is in good mechanical shape and you self manage (since you're living there), I think you can keep those numbers lower. But you want the deal to work with worst case numbers, so 4500/2 = $2250/monthly.
Just using really rough numbers, we have debt + expenses = 4241/month, and gross rents of 4500. So monthly cashflow is 259 bucks a month. I would have to say that that's not great. It's 65 bucks per door, when most people shoot for $100-150 MINIMUM. But, since you're getting into the deal for not a lot of money down, your Cash on Cash is ~18%. That ain't bad.
THAT SAID, I used some really wild *** guesses in coming up with those numbers. You need to figure out what's a fair price for the property. If it's 410k instead of 430, that changes things quite a bit. You need a quote on insurance, and you need to find out what fair market rents are for the space. You need to figure out if any of the units need upgrades, and if so what it'll cost and what they'll rent for after the upgrades. Every dollar you take off of the monthly expenses go straight into your pocket.
Not knowing a lot of stuff I'd want to know before I considered the deal myself, I think it's borderline. But, if the building is in solid mechanical shape and good condition, and rents aren't above market, and you can get discount on the sale price, and find out for sure about utilities and insurance, I think you could get close to $100/door here, which would start looking like a good deal. And really, to get to $100/door, you'd need to basically cut expenses by $150/month, or raise rents (in total) $150/month. Then your COC goes above 25%, which I really like. Cashflow, a place to live, kick *** return on your money, depreciation and mortgage interest deductions, and the icing on the cake (if and when it happens) property appreciation! Sign me up!