I'm looking the jump onto the Might & Magic series,

IV is a good place to start and really easy to pick up and play.
Hell, I remember playing it while still being in primary school, not really having a clue how half of the shit in the game worked, and still managed to beat it.

It's a simple entry for starters. You get visual feedback and don't have to worry about too many things. 3 is fairly similar.
If you have a lot of RPG experience it may feel too easy in which case 1 might be more appealing.
The games from 6 onward have more complex game systems and movement is no longer restricted to grids so they seem like a larger challenge for absolute beginners.

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>>3689098
M&M III is another option, it's comparable to Xeen and probably shorter.

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>>3689098
check out the pastebin in >>3675812
I personally recommend starting with Might and Magic 3 which plays just like Xeen first.

>>3689181
seconded

was my first M&M and I loved it ever since

WoX has a bunch of minor improvements but I think Terra has slightly better world design and pacing