Actually, World of Xeen is an excellent introduction to the genre. It's a lot more forgiving than many, including the other M&M games, and the game mechanics are fairly straightforward.
First of all, don't worry about rolling up new characters, at least not for your first time through. Stick with the default party. It's very well-balanced and is ideally suited to finishing the game.
Second,
this thread has some information to keep in mind that isn't obvious from the manual. You might find it helpful, but it's not really meant as an introduction to the genre as a whole.
As for the map, filling it out is best done by keeping one eye on the field and one eye on the minimap. It's lo-fi, but it's really not that bad - once you learn the symbology used, it's easy to figure out what's what, and the dungeons aren't really that complicated.
Equipment can be a pain to figure out at first, especially if you don't want to spend a lot of money having things identified.
Here is a handy guide to equipment and equipment modifiers.
A few other quick pointers - most of these are probably all in the manual, but I thought a quick rundown might help.
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SAVE your gold! You'll need every coin you can get later in the game. Put your extra gold and gems in the bank - they will earn interest.
- The world has two sides, the Clouds and the Darkside. You start on the Clouds and can switch between the two using the pyramid-shaped teleporters. The Clouds are easier, so you might want to avoid the Darkside until you have a feel for the game.
- Keep your packs stocked with food. You use up a unit of food every time you rest, and if you go longer than 24 hours without resting, your characters will weaken (keep pushing them, and they may actually die or go insane). Resting also restores all your health and mana, and revives unconscious characters (blue health).
- To buy spells from the guild, you need to buy guild membership, which you can find elsewhere in the city. Each character needs their own membership.
- When you find an NPC that teaches Swimming, make sure everyone learns it. All six characters need it to cross shallow water.
- Give everyone a sling or bow. Being able to soften up targets before they enter melee range is useful. When fighting ranged opponents, try to draw them around corners so they can't soften
you up instead. Just like Doom, right?
- The Jump spell will get you past trapped squares unharmed.
- If you have a character with See Secrets (the default party does), the gargoyle arm next to the field waves its arm when you can bash down a wall (the boot icon, or the B key, I think). Some locked doors and gates also have to be bashed open.
- If your inventory is full, you won't be notified if you can't pick up an item from random loot. It just disappears. Keep free slots.
- Speaking of inventory, you can move items from one character to another by clicking the item so it's highlighted and pressing the corresponding key from 1-6.
- Save your game before drinking from barrels or touching other suspicious objects, but you should always experiment - boosting your stats to high levels is key, and these objects are the main way to do that.
I'm not sure if any of this was actually helpful - is there something specific you'd like help with?