does anybody know how much a 6 inch cirlce and 8 inch cirlce cake pan from wilton yields? (how many cups per pan, temp for over, time, servings amount???)

Everything you need to know to make, decorate and assemble tiered/stacked/layer cakes:

http://www.cakecentral.com/cake-decorating-ftopict-605188-.html

Above superthread has popular CC recipes for crusting American buttercreams, several types of fondant and doctored cake mix (WASC and other flavor variations) and so much more!

The Wilton link leads to cake preparation and servings charts which give batter requirements by pan size, recommended baking temps. and times - as well as servings per pan in wedding/party servings and more...

HTH