Self employment and uc.

Hello, I'm looking for some advice which anywhere I read it seems to be fuzzy and or I'm not sure how to interpret it.

I was thinking of starting a flipping business of retro games and consoles. I know a great deal about the industry and very knowledgeable about fixing electronics.

If I buy a product for 30 pounds and sell it for 50 and reinvest the whole 50 into more product and keep doing this. I myself am keeping no profits. I want to do it for fun more than profits. But eventually will take profits...

How do I navigate this whilst on uc... I am also employed, so my uc is deducted anyway...

Appreciate any advice!