Please check the stickies on the corresponding board
What class should I pick? It's all personal preference. A quick rundown of the classes can be found here.
What's the best stat/skill build for class here? Please check the Ragnarok online zeny stickies on the corresponding board. The list of boards can be found here.
How do I get a pet? Venomancers can get pets that assist in combat. To do so, they have to learn the Tame Beast skill, learnable at level 7. If you're playing a Venomancer, you can click on a monster, and then look next to its HP bar.
If it has a little "tamable" icon, you can tame it, unless the icon is red, then your level is too low. It helps to lower the monster's health before attempting to tame it.
When the taming is successful, they get an Egg of the monster. The Pet skill trainer or Pet manager can hatch that, placing the pet in your Pet Bag (press P).
If you're not a Veno, you can get all-class pets. These pets are made by combining various pet eggs at Mrs Zoologist in the southeast part of Archosaur. They can't assist you in combat, but they don't need feeding either.
Will my flying speed increase if I'm in tiger form or using Summer Sprint? No, it will not. These boosts apply to ground speed only.