I have no experience about setting up a business, but have a fair bit of idea.
Firstly I think you should do a sales tax registration and other registrations required as per your area.
Then contact the distributors of the products you want to sell. You can find the distributors from the company’s website. A few distributors I know of are Tirupati, Rashi, Aditya Infotech, MSI.
Contact them and negotiate a deal.
Best of luck !!