Also, what profession(s) should I take. I am a Witch Hunter.
You can only take 1 gathering and one crafting skill. Mythic put the hurt on the 2x gatherers fucking up the economy.
I went Cultivating/Apocathery. The cultivating is fucking boring (there's an add on called PlantMe which automates most of it) but the Apocathery is awesome. Experimenting, getting potions that are volatile and may cause you damage. It's really fun. You can sort of work out what each main ingredient does, what it buffs/heals, then you modify it with ingredients that either lengthen it, make it more potent or increase the quantity.
Since you're witch hunter which is the order equivalent of Witch Elf (correct me if im wrong) I'd go for Cult/Apoc. Just having your own potions and not relying on heals etc is nice. Plus you can make some nice buffs.
I haven't tried butchering/scavenging so I cant comment, but apparently talisman making is a fucking money sink.