Spear Skill Trees
Ok there are two types of Spear Skills:
Single Monster Skills
Lance skills, When you are level two you ALWAYS have to add points to your :insert name here: mastery skills or else you can't add points to your skill tree. But anyways this skill tree usually focus' on one or two enemies at a time so this is a Crucial skill tree for getting things like Urns or weaps, etc.
Multiple Monster Skills
Now, this skills tree has multiple skill names (Windmill, Air Wall, Multiple Lance, And increase lance) but setting that aside this is basically a mob fighting skill tree, if your a "I WANNA LEVEL UP FASTER!" kind of player, i perfer this skill tree, but Single Monster Skills are also very useful.
You don't Have to pick a tree you can pick both if ya want but that's your choice not mine, I leave you with this guide for future references :D