this will be a shorter post, as you should, by now, know the actual mechanics of making items in istaria. just like all games, crafting is a whole lot of doing the same thing over and over and over, until you want to die of boredom.........
but right now, it's still relatively new, so let's get to it! ;-}
the quest journal reminds you that you are looking for a place called pratt's pond (the body of water at the southmost point on the map). once you pass the gem cave, stay on the road until you get the message you have arrived at the trigger point in your chat log and your quest journal. just before that, you should see the area message that you are at pratt's pond on your screen - so expect it!
hack away at the nodes that surround the area, and use the convenient biped stone workstation on site to make the spell shards. my advice is to make twice as many - tell you why later. you know the routine: knowledge tab, formula tab with resource and beginner search (not that you should have all that many forms to choose from), choose sandstone brick, make enough, repeat steps 1 and 2, choose beginner blank spell shard, choose sandstone, make enough. make sure you apply the proper dragon crafting ability to the task! and you did remember to scribe the spell shard form kerian gave you, right? as normal, when you have the needed shards, your quest journal will indicate to return to the crafting trainer's cave.
you could, of course, just go back the way you came - or you could take a shortcut. get back on the road heading easterly past the stone into the flax field. you will see the cloth workstation on the road, and just past it a signpost. stay on the road until you get just about even with the farmstead (don't get tempted by the walking meals!) and jump off the cliff between the two trees. this should put you on the road to the caves, if not right next to them, depending on where you jump off.
once you get back to kerian, he thanks you for your skills!
kerian has one more quick quest - you don't even have to leave the craft cave - before sending you off to the adventure trainer. tell ya about it soon!