I'm about to advertise a 6 year old mare for sale but have no idea of how much to ask. She's broken in but green, hacking out alone and good in all the ways you'd expect of a young horse just started, but can be a bit bolshy on the ground so needs firm handling there. A fairly lightweight, 14.1/14.2 pretty cob x tb type with no recorded breeding (skewbald - chestnut colour rather than bay). Can anyone give me any pointers?