[color:"orange"]skills don't show up till you invest points even after you've bought them?[/color]

Correct


At level 1 of the alchemy extract skill, you should be able to make minor potions, as long as you have the right ingredients. No bowls or flasks are required, though holy water will allow you to make permanent potions on level 4 of the skill. See the link Kiya posted above, or;

Having trouble with alchemy.


The first act is linear by design, but the later acts are more open, with a variety of scenery above ground, and much more freedom in where you can go.