You will be able to find those particular reagents at the bazaar in Olde Town, but unfortunately, you cannot craft that particular robe just yet. But, it's actually really not that bad to level up your crafting. I'm an Adept Crafter, and it really didn't take much, just 2 athames or something and up and on to a new level of crafting.
Hey there! The easiest way to get Fossils is buy transmuting it with Stone Blocks. To get Stone Blocks easy go to Crab Alley and do a few laps around the place then switch realms (rinse and repeat.) For the Fossil transmute it sells in the Celestia Base Camp from the Treasure Card NPC.
For Black Lotus you can transmute it with 10 Ore and 10 Cat Tail which are pretty easy to get. It's the same to get the Transmute Recipe you just have to go to the Treasure Card NPC. And for your second question no, You need to be at least Grandmaster Artisan and to get that you must complete the Celestia Crafting quest called "That Seven Seas Show" Really hope this helps and happy crafting :)