I wouldn't recommend imperishable night because it developes bad habits with your deathbombs. the deathbomb window is really big in this game (half a second or something) and you'll get used to it if you started out with that game. in the other games it's much shorter and you'll find yourself unable to use them when they're needed.
It was the inverse to me. IN actually made me
afraid of deathbombing because it wastes resources (2 bombs for a barely stronger bomb), and the time gets way shorter for non-Border teams after you've already deathbombed in that same life.
Anyway, I always recommend either PCB or TD. PCB has borders, lots of resources, and it's overall easy (although it's Easy mode is said to be almost the same difficult as Normal, but I can't confirm so since I haven't 1cced any game on Easy, at all). TD Normal is even easier than PCB when it come to patterns, has the trance thing, and teaches you resource management since you have less stuff to spend.
EoSD isn't really hard but it has a really short deathbomb time and it has weird hitboxes (knives, bubbles, and YOURSELF), but otherwise it's okay. MoF is kinda trivial since you have a ridiculous amount of bombs (I 1cced it almost at first try back when I was a baby player). And in Normal, SA is harder than UFO, but both are hard anyway, so don't go with these yet unless you're confident or want to stress yourself. :V
And like Saku-chan said, don't waste your time on Easy modo. Start off from Normal like I and many other people did.
And don't play the PC-98 games, they su-- *shot* :V