I believe a lot of the motherboards come without any kind of technical support. If you are looking for someone to walk you through it...then I doubt you should be building a system.
As long as you get a retail motherboard, you will be guaranteed to have a user's manual in it which will basically walk you through the installation of the motherboard...but if you are looking for an actual person to do it...I doubt any motherboard manufacturer offers that.
I personally have a IWill KK266 and I found their manual to be pretty good.