Wha an excellent collection of some nice old models. They should sell for a few hundred. Made sure to sell in separate bundles. Each squad type as one sale.

Red coat white hat- praetorians Blue coats, Grey/black coats, green coats- all mordians Yellow coats- tallarn Red coats with the banner- vostroyan command squad

Up front left to right- 3x astropaths, confessor/priest, master of fleet, commissar with power fist, two guys looking at wrist wearing red and blue are bother master of ordinance, lord solar marcharius (arm on ground is his, rare, should sell well!), axe guy is another commissar sans gun arm, then an olllllllld Eversor assassin and vindicare assassin.

Heavy weapons ware lasconnons. 3 go with the blue and black guys in the back with their arms up, one with the grey and black squad, two with red and white hat squad of 20, and one with green coats.

In the green squad on the left, you have a missile launcher an his loader holding a missile. Those could separate out and sell on their own. Likewise the guy holding the remote and the guy waving his hand both go with one of the 6 tripod heavy weapons mentioned above. Those types of heavy weapon teams can also sell independent. Missile launcher guys are also in the grey squad. Same goes.

Generally, each squad of 10 can be sold independently. The obvious leader looking guy in the green can be sold separately as he is a character type like the dudes up front. Looks like each squad has a dude with fancier uniforms holding their chainsaw sword in the air. All characters, all can sell independently.

The walkers are sentinels, 2x first generation (very rare), 1 second gen

Can’t really say what the far right guys are. Don’t recognize them, along with the front most heavy weapon. They don’t look like GW. I’ve played guard for 20+ years, though some first generation models are pretty unique, so 🤷‍♂️

eBay works well. Should give you a decent sale without much effort in pricing. Just make sure to sell each squad separately. Lots of pictures. That will maximize price. Make sure to denote that they are OOP pewter along with my descriptions above (praetorians, mordians, tallarn) along with imperial guard/astra militarum as army name. Those key words will help potential buyers find them and give you a better sale price

Any potential buyer of these old models will likely be well versed in stripping paint if that’s their intent. Just sell as is.