I think you'll have a higher chance of getting your props made if you put in placeholders in your map and get it farther along in development to show that you're invested in the project. For now, you can probably find many of these either already in the game, on this site, or on the workshop. Just search around for models.
- Tree stump: already in game
- Log stack 1: already in game
- Arrow signs: make them out of brushes and func_detail them
- Tree: many already in game, the Borneo trees look like what you want
- Fire pit: just make a circle of rocks that are already in the game
You can probably find a pot and and single log (to make log stack 2) somewhere on the workshop.