Online business startup from scratch UK 0 funds


hi all, i have just started up a online shop (not running yet) with 0 funds and would like tips to get started, recently applied for v a t number only to find i don’t need one as turnover below £85.000. my mistake, im not clued up to start up, if i get tide card will this enable me to get products retail prices, amazon business must have a v a t number if not how do i get products cheaper in order to sell with a small profit, my idea is to sell a product at X price and when received payment from buyer then buy product from supplier and send to their address. im a sole trader but need my partner to deal in phone calls due to me being deaf. any tips will be appreciated thanks. Geo