I am building a house & would like to know the code requirements for venting my drain

What State are you in ? What City ?

I live in hutchinson ks

Wait for MassPlumber2008 or Speedball. They come in in the morning. They'll guide you through it ....

I work under strict UPC Code in So.California that makes things too complicated and way too expensive for you guys in other States.

But I'll follow your project from distance....

My live in roomie comes from Hutch. She's up there now and will be back in Florida next week. Small world!
First of all, in every state, each and every fixture that has a trap must be vented.
Having said that let me show you how a typical bathroom group will go down.
Toilet connects to sewer main or the stack vent. Lavatory connects to toilet drain and runs a vent off the top the stubout tee out the roof or revents back into a dry vent in the attic..The toilet wet vents through the lavatory vent and the tub/shower connects to the lavatory drain and is wet vented by it. This is a normal rough in and is acceptable both by local and state codes and also The Standard Plumbing Code Book in 90 percent of the country.( Milo's in the excluded 10%) The vent off the lavatory may be run out the roof or revented back into a dry vent in the attic or if you're reventing back into a fixtures dry vent you must make your connection at least 6 inches over that fixtures flood rim.
If you're going t do the work yourself we can hold your hand and walk you through the installation if you wish.