Lots of information asked for here
You should wear a smart suit and preferably a tie. This will make you look professional and you'll fit in with what others are wearing so they will give you an amount of respet before you even begin.
When to perform - this depends.
Sometimes you're booked to perform while the photo's are being taken so this slot is about 30 -60 minutes, depending on the size of the wedding. Other occasions it may be walkaround during cocktails etc. but before they sit down for the meal. Never perform during the meal. You may then be asked to do the night shift which is the after dinner and evening reception which is where the table hopping comes in. This is my preference as by this time a lot of people are already worse for wear so they don't try to catch you out and are half cut which makes if easier for you. You could on occasions be asked to do a combination of the above such as before and after the meal, photo's and evening etc.
A lot of people don't know what they want so you could try to steer them around towards having you for the evening. Also, I wouldn't do it for free but offer a discount in return for being able to take some photo's of your performance (come in handly later) and to also have them write a testimonial.
Introduction wise, just be yourself and keep it simple. I walways do a special performance for the bride and groom which is different to the rest. I do a ring vanish and reappearance in a next of boxes and do something that they can keep afterwards as a momento. Be prepared that often they will have someone video the wedding and this includes part of the reception so you need to ne conscious of ths and if necessary, tell the cameraman where to stand and make sure that you have some routines that will be impossible for them to spot by pausing the DVD
Get a DVD such as Live at the Jailhouse as this will give you loads of info that will help you out as well as a number of good routines. Also Martin Sanderson's Corporate Close Up may be of interest,
Good luck and go for it.
Member of the Magic Circle & The 2009 British Isles Close-Up Magician of the Year
It's not really an optical illusion - it just looks like one!