Hello,
since you want to go for online selling and selling on flipkart and amazon following will be compliance requirement
- GST Registration will be required
- you can show your home as place of business
- Handicraft items are falling under Non taxable and taxable rates so based upon exact item it can be identified
- Normal tax invoice format will do. you can find it online and if not send me your mail id will mail you a sample one
- It is advisable to open a current account and show it for business trasanction though not mandatory
- With respect to interstate requirement it will be same as normal except IGST will apply in place of CGST & SGST + E way bill shall be applicable if product is taxable
- All regular GST formalities will be applicable i can help you will the same your regular monthly and annually return filing