Levels 1-19: At earlier levels playing a WB is a cake walk. We have high HP to start with MapleStory Mesos and if you go with the build I mentioned above you will have around 1k HP by level 15.
Not to mention 99.9% of the mobs you'll be facing at this level will be physical and you won’t have any magical mobs until at least level 20.
You will only have one skill to start with which is Beast Lords Whomp (Bestial Hammer). Use this to quest and grind your way to level 3.
By which time you can go into vanish and can learn Garrote (Strangle) learn it. It's a good soloing skill at lower levels.
I highly suggest that you don't waste any SP on upgrading BH (Yes, bestial hammer. Try and keep up with the acronyms). This skill will become obsolete at higher levels when you'll need the entire SP you can get to get a skill which is actually useful.
Once you get to level 9 go to your skill master and learn your transformation skill this will transform you into a tiger which will increase your movement speed, and physical defense, while decreasing your attack.