I would take some time to prepare, listing for yourself everything you see that you do that is of value for your company. If you've received any compliments for your work, or done any special projects well, then keep those in mind, too.
Then go to your supervisor, mention that you had a one-year anniversary on such-and-such date, and say you'd like to inquire about company policy concerning job performance and salary reviews. Hopefully they'll schedule you for a review. If you've done anything especially outstanding, mention it. If they just want to discuss your performance informally, that's fine, just find ways to fit in the ways you've been of value to your company. Unfortunately, companies really don't care about your financial situation, or if money is tight for you. Personally I wouldn't recommend mentioning that. Their main concern is that you're fairly compensated for the job you do, because replacing and retraining workers can be expensive. You just need to make a case for the fact that you do your job well, that you're of value to the company, and to make sure that you're being compensated at fair market value for your efforts.
Hope this helps.