Welcome! I sell items i have bought or earned, but i no longer want any more. I assure you even if they have been worn, i keep them in top notch condition!
For the multiple sellings, such as flowers, i make sure i give the fairest price, for example if i sell 100 white daisies, and they are valued at 0.42 gold each, i times 100 by 0.42 to get the price(42g). When I am left with a number which isnt whole, I round to the nearest whole number. That way its fair!