Wedding Photography Tips

Wedding Photography Advice?
I'm an amateur photography, and mainly do scenery and pets/ wildlife. Well the manager of my building knows I freelance and asked if I would do pics of her sister's wedding. Nothing big or fancy she said. Well, I know how people are with weddings, the pics have to be really good lol. My photography instructor said along with night photography, weddings are the hardest.
I prefer film but I will also shoot digital for the occasion. Well, I don't think I'm going to do it, I don't want to mess up their wedding. Anyways, weather I take the job or not, can anyone give me some basic tips on how to do a wedding, like whats desirable and what not? From what I assume, it will be indoors, but the reception will be outdoors in the back of the establishment.
I shot my boyfriend's mom's wedding...I definitely felt the pressure and these were people I'm very close with so if I screwed up, I would have been forgiven. I definitely wouldn't call what I got excellent, but the reception was in their garage so the lighting was very poor and all I have is my camera and the 18 -55 mm lens that it came with...so I was more than a little limited. But I made it work to the best of my ability. I only have a few on here, but you can look at them if it helps. Most of them are more of the "details"..I of course took a bunch of family shots and lots of ones during the wedding and reception, but I don't have them uploaded.
http://www.flickr.com/photos/40210644@N03/page3/
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