Hello Odif12321!
1.) This is accomplished by the same button. The minion command button (default “A”) is context sensitive. If pressed while hovering over an enemy, it will command minions to attack that enemy. If pressed over an empty space, it will command minions to move to that space. Once minions move to this empty space, their normal AI will resume, so if they’re close to enemies, they will resume attacking those enemies unless another order is given.
2.) Minions receive 50% reduced damage from all sources. There is a couple of outstanding bugs where this is not applying to all minions for some AoE damage sources, which we do have fixes on the way for.
3.) Mana does in fact have a fixed base regen rate of 8 mana per second for all classes. There are no attributes to increase base mana regen, only percentage increases. The reasoning for this is that mana is a controlled resource for ability usage and is an important part of balancing abilities. You can get sources of “% increased mana regen” on gear, as passives, or with skills. Some skills or passives may also provide flat amounts of mana under certain circumstances, such as flurry’s gain X mana on hit. I certainly agree this is something we can add to the game guide, and have added it to our list of game guide improvements to be made.