New tan number

1. While applying online TAN, what is the procedure ? and what documents to be submitted alongwith application form.  somewhre I am getting we need to submit copy of PAN and copy of ROC certificate of company only, and somwehre I am getting that no any documents to submitted alongwith TAN application.

2.  We want to manage separate TAN number for separate location.  What other things to be considered while applying for New TAN if we are having already few TAN numbers at different location.