Hi! Exploring strategies for "Retrenchment/Retirement" safety net. What it takes to "Open Shop" on online platforms such as Lazada, Shopee, etc.?

Been thinking about the feasibility of "opening shop" online as an alternative to investing for .. Retrenchment and pre-mature retirement.. But unsure about the matters relating to payment to overseas supplier and also cost efficient ways to ship goods from overseas to Singapore. Appreciate if members here with expereinces in ordering (from overseas supplier, eg, in China) and selling on online platforms can share some information. Many Thanks!