I'm really bad at making tactics, can you simplify a bit it for me?
Not sure how much more I can simplify. You don't have to be a tactical guru - I'm certainly not - but you do have to stop and actually think about what you are trying to do and what helps you accomplish that.
The key problem with the OP question here is, as WJ points out, lack of clarity on what "dominating the midfield" means to that person. You asked about having a lot touches and completed passes. But to someone else, that domination could be someone who attempts a lot of thru balls, creating some CCCs and probably some goals. But it could also be a Kante style ball winner, or someone who picks up the ball deep and drives forward.
You need to look beyond the player or the role. You need to think of a tactic as a whole, with specific aims and structures. And "controlling the midfield" - whatever that might mean to you - needs to result in goals and wins, or its rather aimless and pointless.
If you want someone who is control the passing from the center of the pitch, you are generally looking for a possession game. So think about what that entails. Are possession-focused teams typically smashing 40 yard passes up to a target man? Are they relying on dribbling at defenders? Are they racing at goal full speed, a la Klopp's Dortmund? Generally, none of those. A typical possession side is going to be slower paced, rely on passing to move the ball, and generally not all that risky. You don't want a total extreme or you end up with completely gutless possession and no way to get the ball into the box - a la United under van Gaal.
So think about your formation. Do you want a lot of players forward in a top-heavy formation? Does having 3 forwards or a forward and two high wingers really help that much with controlling the ball? You need to make sure your players have passing options, and especially the playmaker you want controlling things. Narrow, 3 striker formations are popular - but do they logically seem well suited to hanging onto the ball in midfield? Do they provided nicely spaced options in all directions? Which is not to say you CANNOT use certain formations for certain approaches, just that some are more suited and that will make things easier.
When it comes to mentality, do you want high risk? Do you want the players moving at top speed? You can be very attacking without resorting to more attacking mentalities.
Team instructions... again, just look at what you are trying to accomplish and what the TIs do. I don't even tend to use TIs that a lot of people would for possession - Retain Possession (because it blunts attacks a bit) and Shorter Passing (because it restricts options) are not necessary if you set things up well and balance it.
