It really isn't rocket science.
You work out what your fees will be and list items at a price that will make the sale worthwhile for you.
If your items sell well, you will make a profit. If they don't sell for the price you need to stay on top, you're doing something wrong.
The model railway items you're selling are super. They will always be in demand, so I'm sure it's just a matter of judging what to sell them for - and what to buy them for, too!
Good luck! Why not try asking for some tips on the business sellers board? This Q&A centre is more about trading questions.
