Vat clarification for karnataka

Hi , I have a question regarding purchase of good and resell within Karnataka

Im buying Computer equipment from a dealr in Bangalore and will pay the applicable VAT as the dealer applies. I would then resell this equipment to my client for a margin. My questions are the following:

• Do i need to apply for a TIN Number ?
• What % of tax should I invoice my client for - do i need to recharge them VAT for the full equipment/hardware ?
• If i bill them for VAT , then do i pay the govt just the difference ( on the margin i make) or the entire equipment
• Do i need to apply for e-sugam - the goods will be delivered directly from my dealer to the my customer's place. Im just the intermediatary 

Kindly advice since im new to VAT practices 

Regards