The AME is one of the simplest engines available. You put together the multi-tile structure, stick some fuel into it, and you're all set. This doesn't mean it isn't potentially dangerous with overheating though.
To assemble an AME, start by wrenching down the controller on the far end of a HV wire. On most stations, there's catwalks to assist with this. From there, start putting down a 3x3 or larger square of AME parts in preparation for construction, making sure to maximize the number of "center" pieces that are surrounded on all 8 sides.
Once this is done, you can use a multitool to convert each AME part into shielding, which should form a finished AME configuration. From there, insert a fuel jar, set the fuel rate to [color=#a4885c]twice the core count or less[/color], and turn on injection.
The closer you are to the perfect ratio of [color=#a4885c]1:2[/color] (1 AME core to 2 fuel rate) the more efficient you'll be. You're cutting fuel efficiency to [color=#a4885c]50% and less[/color] if you're using more cores, but less fuel injection rate.
For an example [color=#76db91]3 core and 6 fuel rate[/color] will generate [color=#76db91]240kW[/color], while [color=#f0684d]8 core 8 fuel rate[/color] will generate [color=#f0684d]160kW[/color]. Generating 80kW less while spending 2 more fuel each injection.