KAZESUI'S PROFILE

There is only one way to do it. Decide on a maximum amount of units for the player (and any enemy as well), and create an event ahead of time which shows the graphics of the different kind of units that event can represent (as well as some event pages to represent functions to be executed by the specific event).

You leave all events "inactive" initially and then summon them with "change event location", switches/variables and what not when needed.

Of course, choosing another program to create the game, like game maker or scirra construct would also make a lot of sense when making games like that.

Probably browser related or something, but you can try to hold down ctrl while using the scrolling wheel on the mouse to zoom in and out

Have a parallel event use a "move picture" with 0.0 wait with "wait until done" unchecked set to the screen relative coordinates of the hero, possibly with an offset (i.e. after getting the screen relative coordinates add or subtract some value the variables before using move picture)

and have a separate event which handles input toggle between the pictures in your animation with "show picture" at the same coordinates as those given in the parallel event.

Having some fun with Construct 2

It's well worth getting good at trigonometry though, since there's tons of stuff you can use it for. Math is a good tool to get games do what you want. And you're going to have to look into the terrains idea either way, since the example uses it as well.

The tutorial should help you figure out how it works, but if anything is still unclear, feel free to ask. That way I might be able to improve the tutorial to be even more understandable