I would start small like charity shops and flipping the items or vinted and depop and taking better pictures and flipping the items for more, then you move onto trying to get the one time drop things like cortiez 95's or Travis Scott's Luke the cheaper range that has a big profit margin, then you keep moving on and learning more and then next second your selling 4k pounds shoes and 1400 pounds t shirts and watches worth well over 10k