it's been a while since I played this game, You should ask this question on the main discussion board . The game's developer is quite prompt in answering any questions. I suppose the default starting party can't be that far from what you're asking..

What class do you suggest for beginner starting-just to get used to game maybe?

no need to watch it all at once. If you have a particular mechanic that you're most curious about you could just watch that ..

1:04 Base Attributes
10:59 Rating to Percent Transformation For Derived Attributes
16:22 Attack Table and Hit Resolution
22:07 (melee)Attack Power, Ranged Attack Power, Spell Power
26:00 Calculator App Intro [AA damage/ability damage formulas]
39:44 Aggro System
47:14 Character's Action Queue (pharantesis)
1:01:50 Calculator App [queue cooldown illustrator]
1:28:22 Assassin Guide
2:00:20 Duelist Guide
2:17:00 Ranger Guide
2:36:40 Protector Guide
3:15:56 Man at Arms Guide
3:34:50 Paladin Guide
3:56:45 Mages Guide
4:15:00 Elementalist Guide
4:39:15 Warlock Guide
4:47:51 Arcanist Guide
5:09:26 Druid Guide
5:19:30 Priestess Guide
5:27:30 Necromancer Guide

I wanted to start to watch this but saw it was over 5 hours?