When should i apply for vat/cst

I WANT TO START A STATIONARY ITEMS WHOLESALE BUSINESS IN CHANDIGARH FROM MY HOME ITSELF AND MY SUPPLIER FOR THE SAME IS IN DELHI.

HE WILL SUPPLY ME THE ITEMS WITH PROPER BILLS.

BUT I AM CONFUSED HOW TO SELL THOSE MY LOCAL DEALERS i.e HOW SHOULD I GIVE THEM A BILL? I DONT HAVE HAVE TIN OR DIN NUMBER. DO I HAVE TO APPLY FOR IT? OR IS THEIR ANY OTHER ALTERNATIVE. WLL A SIMPLE HAND WRITTEN BILL WITHOUT ANY VAT WILL DO? MY ANNUAL TURNOVER WILL NOT EXCEED 1 LAKH.

KINDLY HELP ME OUT ON THIS PLEASE.