I have the same situation. I have new inventory and some older inventory. I have a website, so all new items get posted there. If they don't sell right away, I will wait a month or two, then have a sale. If the items still don't sell, I will break them down and use the beads, components for new projects. I use good beading wire, so when necklaces are broken-apart, the wire is not long enough for another necklace, so I save the wire for bracelets. It's my way of recycling wire
I also have a bad habit of not separating my beads when I am finished with a design
Initially, I try to keep everything in order by stone type, color, etc. Sometimes I just get busy and all extras get put in a bin. Once or twice a year, I will sort out everything and all the misc. beads, components and pendants I haven't used, etc. will be put up for sale on E-Bay. I just sold 20# of beads for $120. The buyer was so thrilled and the $120 will go towards more beads tomorrow at Bead Fest!!