There's no good advice to give you about reserves Sue... sometimes I use them , but much more rarely than previously, as you just end up paying your fees twice over.
If I have room in my profit margin, I will start as low as I can and keep my fingers crossed, if I have paid heavily for something, then I will start at what I think it is worth.
Sometimes it will sell happily at the high price.
Sometimes I will start high and it will not sell, so then I will start low and it sells for more than the high price I started it at previously.
Contrariwise, sometimes I start low, and that is where it stays and I don't make any money...
I'm not sure I am helping......