Started development on a jrpg inspired game Thread

I finished writing the first draft of the script and now doing side quest, and a friend is modeling some of the characters, and I know we will need help in the future , I just want to know what else can be done in the meantime?

You can start on soundtracks, and other audio work. Concept designs for characters, locations, enemies.

Coding to see if your battle, movement systems work, talking to npc's, finding items, inventory, all work. You don't need fancy elaborate models for that, you can use place holder cubes or spheres. Just have to make sure that when i touch this 'enemy' are we transported to the battle screen correctly. When I talk to this 'person' does the dialogue tree flow correctly.

Just start coding, or setting the ground work for all the things you need.