you going to sell them on here? I'd just take offers, or set the sort of price you'd expect to pay for a loose figure that's still relatively easy to come by. For those that are the same as they would be out of the box, you'll have to charge less than retail. Those with add-ons, maybe take the price of those additions into consideration.
If you go down the route of selling them on ebay, make sure you have a couple of pictures of each (robot and alt mode) and describe them correctly. I personally tend to avoid sellers who put "RARE!" "LOOK!" or similar needy/scam sounding stuff in the description too, but it might be a tactic that works for some.
Good call on trying to sell some as lots. I might not want some toys, but will consider them a welcome bonus if they're sold with something I do want (case in point, the 2nd Battle In Space Rodimus and movieverse Prime I picked up with WFC Prime and Bee in a lot a few weeks back) and those AMs that form larger things (the sword and shield) will probably sell okay as sets.
assembling a Neo-G1/TF:TM cast. Please PM if you have (or know of) the following at a reasonable price: Classics or Henkei Prowl, Astrotrain, Ramjet, Skywarp, Sunstreaker, Sideswipe, Blurr, Perceptor, GDO Wheelie and Springer, or 3rd Party Motobot Arcee, FP Springer, iGear Ratchet and Ironhide, City Commander (and/or Ultra Magnus), Starscream (deluxe) Coronation add-on, or Spike and Daniel in their Exo-Suits.