1. Click the number of javelins you want, and than click on your character portrait. The Javelings will now be selected as your weapon. As for the Baton, just click the baton, and not the thorn's, and do the same with the Baton.
2. When you're in the buying screen, look at your portrait to the right, and look at the inventory. Now you will see how many items can be sold and for how much. Be careful though; the shops only have so much money.
Glad to see you like Geneforge. Trust me, you're in for a fun ride.
The Last Archon