Well I am a bride to be myself (and congrats to you, btw!!!) and I'm looking at doing similar things myself. I'll tell you some of the things I'm doing...
I am doing pretty much EVERYTHING myself, lol... I found a reception room for $75 and I'm looking at about $10 a person for dinner. I am undecided if I'm going to have an actual dinner or not yet, only cuz my fiancee has been out of work (he finally got a job, yay!) but I have been unable to save ANY money for the wedding because of this, and my wedding is 7 months away, so I'm thinking of just having dinner for our immediate families and attendants and having a later reception for everyone else to attend to have cake and drinks. As for drinks, I'm going to pay for soda (*maybe* beer, if the budget allows at that time) and have a cash bar for anything alcoholic (mixed drinks). My fiancee and I don't drink ourselves, so for us to just have soda is fine, however I know others will want alcohol, so I think this is the best thing to do. As long as you remember to put this on your invites that there will be a cash bar available, that way they are prepared and there are no suprises.
My cake... I actually found a girl in town that makes cakes out of her house, which is great, I'm getting a cake that feeds 114 people for about $200 which I think is pretty good. However you may want to check with your reception site, cuz I know that a lot of places around here will only accept a cake brought in from a licensed baker, which my girl is not. Walmart is relatively inexpensive for cakes as well, and I'd check with other local grocery store bakeries, I've seen some lovely cakes from my local grocery stores as well!!!
If you're not too picky about having a fancy invitation, you can do your own. You can buy kits at Michael's or Hobby Lobby or Office Max or Walmart or wherever... but since I'm having a fall wedding (oct 25th!) I just got some pretty stationery from Office Max that has autumn leaves on it, and some nice postcards (for RSVP cards) and some plain off-white envelopes to match. For me, I didn't need anything formal since we are having an informal/casual wedding. Plus it cost me about $40-50 for everything, in comparison to spending $100 or MORE for invites... then you gotta buy stamps yet, eek! Which is why I went for postcards for RSVP cards rather than actual cards with envelopes cuz the postage is only 26 cents for a postcard.
I'm not entirely sure about getting a dress anymore (I wanted to have mine ordered by Jan 1st but since my honey was still out of work it didn't happen so I'm going to wear my bridesmaid's dress from my friend's wedding a couple years ago as my dress) but I was going to get my dress at http://www.bridalonlinestore.com/ I know someone who got their dress off of there and the dress was AWESOME! I'm actually going to have my bridemaids still get their dresses from this site. I highly recommend them!!!!! Excellent customer service as well... they are great!!!!! :)
I'm also doing my own flowers (nothing overboard, I'm having VERY simple bouquets and boutonnieres) and my own centerpieces (small globe-like candle holders and putting small pillars in them with little stones in it for color and a ribbon around the neck of the holder).
I'm also doing my own favors. I got some tulle real cheap (check around!!) and I'm making what's called "Spoonful of kisses" You take a plastic spoon and put a few hershey's kisses (I'm going to use 4-5 for each) with it, wrap it in the tulle and tie it off with a ribbon, and then the little tag says "A Spoonful Of Kisses from the Mr. and Mrs." and then has our names and wedding date on the tag as well.
Hope this helps you!!! Good luck to you!!!! :)
oops, also check out http://www.orientaltrading.com/ for other items, you can get their wedding catalog and they have nice stuff for relatively inexpensive. I'm getting my guest book and toasting flutes from there, along with some other decorative stuff...
Good luck!!!