Here's a link to the classes section of the bg3 wiki. It has all of the classes and what they get at the various levels. I believe it's close to 5e, but not always exact. There are some changes, to my understanding. I've played plenty of bg3, but never 5e tabletop.
https://bg3.wiki/wiki/Classes*
I like the idea of a monk/sorcerer, but personally, I haven't found a build I particularly like yet. The attributes end up getting spread a bit too thin for my liking. It needs dex and wis and cha, and I never want to let my con go too low...
There are, of course, items in the game that can help with this. For instance, you can find gloves that can increase a stat. But I've never been one to build a character off of gear I knew I'd be able to eventually find.
The game also allows you to respec your character for a very small cost. So, theoretically, you could always wait till you get the good gear to bump your stats, then respec to switch around your point spread. Plenty of folks do this from what I've seen, although, again, it's just not my playstyle. I can't imagine respeccing my character midway through the game without some huge story driven reason why. But all the same, it works for some folks.
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To my understanding, the draconic armor and the monk's unarmored defense do not stack. It's one or the other for the character, so that's worth considering.
