Yeh, nerves to start but then great when you get into it!! (I missed all the lovely food I was so nervous!!)
Remember that when looking online most of the stuff has been done before like the keys etc...Just use some of the ideas as a guide! use picturers, get some of the audience to help you with some bits. Be polite and dont take the p155 too much and say anything you will regret afterwards!! you may be taped after all!! Topical is good too.. Do the usual with the thanks etc..
I had a series of stories, which 1/2 of I couldnt tell but the groom knew the whole story so I had a list on a powerpoint slide that had headings like "the one about the pool table" and "the one about wendy and her sister" and then some others that were less risky! like "the one about the athletes foot", lots of our mates knew the stories but his family and outlaws didnt so when I read out the headings, there was laughter and gasps... I then had a tombola that had numbers inside (releating to just the ones I could tell....) and envelopes infront of me with numbers and thengot the bride and the bridesmaids to pull out the numbers getting involved in the game of chance.... the groom was $hitting himself every time a number was pulled out... and the audience were calling for the numbers to be read out from the ones that they knew were bad... Went down well...
One I was at that was good when the best man did a sort of mastermind game with the groom and asked him questions... Just needs a bit of setting up and a spotlight!
Just remember to practice and do a run through with a few mates to gauge reaction!