Have you thought about the Bank of America secured card?
I think it's the best in the secured CC's market for now.
Secured credit cards are pretty much a requirement for a non-student... there's a few unsecured lenders which charge massive fees which personaly I'd avoid.
BOFA is definitely worth a look if you can get it: their secured card now has their 1-2-3 rewards package which is absolutely the best in this strata of card.
Cap One is another good app too.
You want at least 2, and perhaps 3 (anecdotally people have had better results by three), but 1 is absolutely too few. A third card is basically anything you can qualify for, but six months positive history on a pair of credit cards opens up some better options too than a secured (like an Amex Zync among others).
Careful, both BofA and partially secured Cap One cards are NOT GUARANTEED APPROVAL. In fact, with BofA , there are lots of denials.
OP, do you have negatives on your credit report or basically just a blank file/thin file?
Here are some guaranteed approval cards that aren't a total ripoff:
firstprogress.com: not too high annual fee and no outrageous terms like no grace period
SDFCU (need to double check this one but pretty sure it is guaranteed with deposit): No annual fee, get interest on security deposit, up to 100k secured card available.
LIMITS IN CARD DESCRIPTIONS
2-3 cards will build up FICO score faster. However higher CL on card will help.
@Anonymous wrote:
I checked my credit report and it says I have one bad mark against me. I broke a lease on an apartment building and they put a 9k mark on my credit last year. Would I still be able to work up my score with this bad mark? Would it even be worth it?
It is always worth it to build your FICO score up 
.
Yes you can still make improvements, get the secured cards; though as Crashem correctly points out there are some which are more difficult than others to obtain. Worst case go with "high risk" lenders and just eat the fee structure for a year, you absolutely want to get positive history on your report.
I think OpenSky doesn't even do a credit check; I don't know anything about them but people have posted here about it.
Dapper Dan: need two credit cards anyway, secured reporting doesn't matter too much, and BOFA in this case graduates anyway and will grow long-term with an individual. FICO building isn't a short-term endeavour; however, it's a good point that if you don't have much money for the security deposit or AF, it's pretty much impossible to beat C1's offering. I hadn't looked at it that way previously, thank you for making it.