I love the genre and I played a fair bit of them so here are some pointers, if you ever need more info on specific stuff just ask either here or just add me on Discord if you prefer (TaiTsurugi#1591):
First of all, if you have the possibility, never play CRPGS on console. They were always designed around the pc, and the console just makes everything more clunky. The UI and the inventory management is hell without hotkeys and a mouse and Real Time with pause (RTwP) games are borderline impossible to play, as you need to continiously micromanage you party.
Regarding subgenres, most CRPGS can be classified in Turn-Based and RTwP. Turn-Based are usually more clean to both play and understand, as you don't need to pause and micromanage everything. One big advantage of RTwP tho is that fights are way faster, Turn-Based ones can really drag on when you have a lot enemies in an encounter, especially the easier one, in RTwP you can just go auto for the easier fights.
>Dices and numbers
Rules and system vary greatly between games, but one big distinction is between old (or old school) titles and the more modern ones.
Old stuff was generally based directly on either DnD or other PnP RPGs while modern ones have rules made specifically for them (and in most cases they are not really well thought out *cough Pillars of Eternity *cough). Modern ones are generally easier to understand, but old one have more depth and are more complex, and give you more freedom in some aspects.
If you want to go into old ones you will need to read and study a bit more to understand their system, but it's way easier that what it seems and considering most are based on DnD once you undestand one, everything will translate to the others.
Most formulas are just Roll+Modifiers so they are not hard, the thing to learn is just how to maximize the different modifiers and how to increase them
Dice rolls are not really a problem outside of the early game. At the start (less in the modern ones) you will miss a lot and some fights can be decided by a good or a bad roll, but once you get some gear and some level everything will even out and will not be any worse that any other "normal" RPG.
>Baldur's Gate 2
One of my favourite game of all times, you will need to study the systems a bit, but it's well worth it.
The game is RTwP, with a great system based on Advanced Dungeon and Dragons. The itemizations is top notch, with a lot of unique and strong items with interesting effects like, giving you more attacks, freezing on contacts, letting use specific magic etc. Enemy and Boss design is also top notch, with different enemies needing different tactics, a lot of them have specific weakness or have unique charateristic. Troll for example can only killed by using either fire or acid and stuff like Illithis drains you intelligence and can mind control. The game is also non linear in some parts, you can explore different areas and find a lot of cool items or bossfights if you know where to go and how to fight them. The party members are also great, and will also somewhat react to your choices and have specific banters based on the composition. Some party members also hate each other and will end up either leaving the party or even (try) to kill each other if they are in the same party.
>Dragon Age Origins
Is a good starting point as it has an easier system and is less punishing than something like BG2 but it has also some problems. It only has 3 classes and 3 races so not a lot of choice and not that much depth in the level up system (in general is way too linear and doesn't offer much choice). Enemies are also kinda of a problem, they are all kinda samey so fight can become a bit boring especially in the late game. That said is still a great game and it has a good RTwP combat system that is pretty much Baldur's Gate 2-lite, also it has a good bit of Choices and Consequences and different ways to complete quests. It also offers a lot of Roleplaing opportunities, starting from character creation with the origin system, that not only changes the prologue but also some different events. If you choose a Mage for example, later in the game when you will go to the mage tower later in the game, you will have different dialogue options that reflect your background. Same thing if you start as a Dwarf etc.
I will avoid Pillars of Eternity, is an all around mediocre game with a terrible stat system, a really bad story and some terrible enemy design. Pacing, exploration and itemization is also subpar. Just start with Dragon Age and then go into something like BG, Icewind Dale, Planescape Torment (if you want an amazing story), Pathfinder: Kingmaker (one of the best modern ones) or stuff like Divinity Original Sin if you prefer turn based.