It's more enjoyable to OSRS gold find these things yourself? It will be obvious that all the information you find online is useless until you go out to see it. The most effective way to ensure that the dagger lasts for a lifetime is +.
The one that starts herblore and the one to begin summoning(so you can gain acess to those skills of course)then it all depends on buy RS gold your levels for instance are you able to complete the quest to find the city. You can train members to be whatever you want. Rock crabs are a great rock to experiment with.