Congratulations! Probably the biggest cost multiplier for a wedding is the number of guests who will be attending...this affects everything from the size of the venue, to the number of invitations (even if you make them yourselves, it can get expensive and time-consuming to do all the printing, not to mention postage), to the amount of food to be provided. Being able to control the cost of your wedding depends a lot on how flexible you're willing to be in your vision of what you want the wedding to be like.
FWIW, My husband and I got married for about $600, including the cost of a photographer, the wedding rings, and the marriage license. How we did it:
-We had two guests, who doubled as the two witnesses we were legally required to have
-I made my own dress (if you're into DIY, give it a shot! It was simple, pretty, and comfortable, and best of all fit perfectly since it was made to my measurements...and all materials included cost about $20).
-All flowers were cut from our own garden
-A friend did one of those online minister things so he could legally perform the ceremony (for free!)
-The photographer was a student, not a professional (and did a FANTASTIC job)...we paid her a set hourly rate and gave her photo rights so she could use the pictures in her portfolio.
-We got married at a public recreation area (a lake way up in the mountains, so it was totally uncrowded as well as beautiful) so we didn't have to pay to rent a venue...if your wedding is small, you could do something similar in a lovely city park that's wheelchair accessible.
-We made all the food ourselves (obviously, with so few attendees it wasn't hard!)
-The rings, which were the most expensive thing other than the photographer, were made by someone on Etsy out of upcycled rosewood and turquoise (no precious metals or unethical diamonds )
Overall, we just decided that since it's the marriage that's really important (not the wedding) we said screw the wedding industry and everything you're *supposed* to do...and ended up having a beautiful, wonderful, tiny little oddball wedding.
I hope this helps give you some ideas or places to start at least...just try to have fun and don't get too stressed, and congratulations again!