How to share internet using PTCL DSL and File sharing

I am using PTCL broad band internet at home.I want to share internet on my 2nd laptop.please guide me that how may i do that.

2-My 2nd problem is I want to share file ,audio and video with both computer.How may i do and what things may I need to do ?

In short i want internet and file sharing .please guide me.