based on my experience...
1. usually a few days after you applied, they will come to your house to install the dish and box, then hintay ka uli a few days bago ma-activate yung account mo.. be sure complete ang documents mo at kulitin mo yung nag-install nai-submit agad sa cignal kasi yun ang pagbabasehan nila kung ia-activate na nila yung account mo, all in all 1 week aabutin..
2. yes, may dumating mang bill sa'yo may credits ka pa valid for the next month (ex. Php 990Cr)