Depending on the country if there are not a lot of buskers then get a simple sign saying "magic" or "Magic show" get three effects you know inside and out that you can do anywhere routine them together and put out a hat or can or something to collect money and perform your three tricks and then either ask for money and hold out your hat or whatever and start over again.
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this link will give you EVERYTHING you need to know to actually street perform he is a Master at it and lives on it full time.
http://jimmytalksalot.blogspot.com/