This is true, those without alchemy can make +200 flasks. Those with alchemy make +250.
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Yup
Work orders are started each day by paying 5 of a random material (changes daily) for 20 GR in return.
there is a trader in the building that exchanges GR for any material (skin, herb, ore, fish, meat) at 20GR for 5 material.
They grow in the world only, so y there can be competition. But they got a ton of spawn points so still might not take long. Currently for 19 work orders you need 190 timber. It takes me 20 minutes in Nagrand (small gives you 4-6, medium 7-10, large 11-14) since there are a lot of large ones there. All zones are good tho and yes you can like log your alt and farm 1k at once if you want and then send work orders as available. 19 work orders take 76 hours, so it won't be a big deal to do it once every 3 days.