You need to see a LW trainer ,,, there are different levels of trainers for each skill cap I think the next cap after 150 is like 225 and then 300 ... My Lw is 300 and I have had to bounce around some to find trainers .... Whatever toons racial capital city is , near your original trainer there be another trainer near by ... other wise try going to another capital city and looking there . There is ones in undercity , orgrimar and thunder bluff that I know of so maybe check out those places . Whatever you do though , take my advice on this ... try to keep your LW skill close to your own level , what I mean is try to at least keep the items your crafting close to your level . When you hit lvl 40 you want to be around 225 skill LW . The mobs at your level will provide the materials you will need to make those items ...