I hope that that is another attempt at humor. Your post was made on August 24. People have busy lives, and just because you don't receive a response within forty-eight hours doesn't mean that you are not going to.
For the video, you can use Vegas' built-in encoder, but you will probably get better quality if you render a lossless AVI and use x264 (for which MeGUI is a popular GUI) if you want to make a BD or HCenc if you want to make a DVD. I assume that you converted to RGB properly before editing. If so, make sure that the lossless AVI that you render from Vegas remains in RGB and that you convert back to YUV properly: failure to do so might well make your video look darker. There are instructions for converting to and from RGB in AviSynth in my guides.
If your version of Vegas has a built-in Dolby Digital encoder, use that for the audio. If not, you can use eac3to (for which see my guide) or
Wav to AC3 encoder; both are free.
I can't advise you about DVD Architect because I don't use it. Vegas users will have to help there.