First things first... you MUST have a small emergency fund to get you started.
1. Put $1,000 in a separate bank account that you don't have easy access to. Don't touch it except for emergencies (birthdays, valentines, christmas, etc are not emergencies).
2. Put together a debt snowball and aggressively pay off your debt. This includes making, and sticking to a monthly budget. Making a budget is critical to being able to successfully pay off debt and staying out of debt. You can't pay it off if you spend more than you make. This means you have to figure out where every penny of your money is going every month, don't omit anything. Include a line item in your budget called "Splurge Money" and take that amount out in cash every month, use it for things like "needed mcdonalds, didn't have enough time to make dinner".
Snowball debt calculator - Become debt free at WhatsTheCost.com
3. Put aside 3-6 months net pay in savings if you are married (and both reasonably employed), 6-9 months if you are single (or you're married but only one of you is reasonably employed).
Do these things in this order, and you'll be debt free sooner than you ever imagined.
Along with this, since you're looking at how to spend your refund, I would strongly suggest taking $100 of it and spending it on a Dave Ramsey Financial Peace University course. It is designed for a wide audience of people, from those who are buried in debt and receiving collections calls, to those who are debt free and trying to figure out how to most wisely invest their money. It also incorporates every learning style (auditory, visual, hands-on, reading, etc) so you're guaranteed to find an option that you benefit most from (unlike your standard college course where a professor dictates out of a textbook and says 'good luck').