It is also helpful to know that if you make any mistakes in you character build, you can respec your class and ability scores very early in the game for a fairly low price. The things that you cannot change are your origin, race or appearance, but these don't have such a great impact (unless you take the Dark Urge origin and find a bit too bloody for your tastes - in which case you have to start over)
Personally, I never played DND but I did play a bunch of RPGs before (such as the Pathfinder games on PC) and I love checking out character build guides. The learning curve of BG3 was pretty smooth for me.