i wanted to download games from this site http://www.omnigsoft.com/Android/ADC/readme.html and put them on my g1 but i dont know how to do it. so i was wondering if someone can give me a quick guide on how to do it

I believe those where developed for a older version of Android, so they won't necessarily work for the current version. You might want to email them and see if they would work. But I don't think they will. But to download games from websites like this one you need to access it from the browser on your G1 and then download the APK file.