So, here's how many actions you can take per turn. Current skill points, ignoring the base 3 you started with, halved. So you have 10 skill points. Thus you can take 5 actions. These actions can be spent generating industry or research points, or be used for various other projects. You can, if you want, double up on actions. For example, use two actions on a industry project, or use three to hurry up and finish a research action.
And by the way, if you want, you can go over your action limit, but doing so is innefficent and causes maluses. So say you had a sixth action you REALLY wanted to do. Well, if you decided to go through with it, I would either subtract a dice from that projects roll, or I would add a malus to all the dice on all the projects.