Hospitals tend to be large, fairly static organizations without a lot of flexibility. In most cases, they either offer
things like sign-on bonuses and loan repayment and you automatically get them if you qualify, or they don't
. Not a lot of room to negotiate. Also, you'll be graduating with your entire class, right?, and there will be a whole crop of newbies out there looking for jobs (and the hospitals know this). If you aren't satisfied with what they are offering you, there are plenty of other new grads job-hunting in your area and they will just move on to the next applicant.
Sometimes, nurses who have particular skills and experience that a hospital really needs are able to negotiate quite a bit in terms of salary and perks, but new grads fresh out of school are a financial liability
for hospitals for at least the first year or so, and the hospitals have little incentive to go out of their way to entice you to come work for them (as compared to any other new grad). I don't mean that to sound harsh, but it's just the way it is. If a sign-on bonus and/or loan repayment is really important to you, your best bet is to identify hospital(s) in your area that offer those benefits and apply to those hospitals. You're unlikely to talk a hospital that doesn't
already offer them into making a special exception in your case.
Also, as you're job-hunting, be aware that hospitals that do
offer generous sign-on bonuses (esp. to new grads) often have some v. good reason for doing so -- i.e., working conditions are so bad there (for whatever reason) that they have a lot of trouble keeping staff.
As for asking for an interview, most hospitals have their open positions posted on a bulletin board in a public location somewhere in the hospital -- just look over the open positions and fill out & submit (to Human Resources) applications for the ones that appeal to you. HR will take it from there. Good luck with your new career!