You are requested to lead out in the cutting of the wedding cake at a wedding reception is there any detail to follow?

There are not too many rules to follow. Usually, take a slice (reasonable size) out of the bottom tier or tier just below arm level. The bride and groom get the first slice, if they are not the ones cutting the cake themselves. It would also be nice, if you are cutting the cake for them, to wish the bride and the groom a healthy and happy marriage.