Can you guys give me any tips about stacking cakes??

How to stack/tier cakes:

http://tinyurl.com/y22z72
(Has complete and accurate directions.)

More on SPS:

http://cakecentral.com/cake-decorating-ftopict-561846-.html
(See leah_s post.)

SPS sticky by Leahs:

http://www.cakecentral.com/cake-decorating-ftopict-603925.html

(Illustrated) How to cut level dowels by indydebi:

http://cakecentral.com/cake-decorating-ftopict-434013-.html

Wilton's tiered cake help links:

http://wilton.com/cakes/tiered-cakes/

HTH