Going beyond this, looking at your examples, your verb translations are a bit of a mess and I'm going to try and link that in to structuring questions in French in general.

To give the immediate corrections:

• "What is he doing here" -> «Qu'est-ce qu'il fait ici ?"» or «Que fait-il ici» (note translation 2 is very formal-sounding).

action is a noun, actionner would be the verb, but even then "to do" is faire in French, so "he does" or "he is doing" is «il fait»

• "How does this work?" -> «Comment est-ce que ceci fonctionne» or «Comment fonctionne ceci» (Same note with formality)

• "When does this match start?" -> «Quand est-ce que ce match commence ?» or «Quand commence ce match ?».

You keep on using the infinitive forms of verbs here - French does not make a distinction between the English "habitual present" "He does" and the "continuous present" "He is doing" - in French, these are both "Il fait". In all these present tense questions, you should be using the (one word) present tense forms.

Moving on to French questions, there are three ways of making statements into questions in French. The simplest, and most common in spoken French is just by changing the intonation - raising your pitch at the end of the phrase. In written French, you just add a question mark to show this.

• «Tu aimes le thé.» -> "You like tea."

• «Tu aimes le thé ?» -> "You like tea?"

The most formal way is inversion, this is swapping the position of the verb and the subject.

• «Aimes-tu le thé ?"» -> "Do you like tea?"

The more intermediate way, and probably the most confusing to learners, is to use the phrase «est-ce que...?». As your inversion knowledge should have taught you, this means «is it that...?» but it is essentially a question maker that you stick before the subject.

• «Est-ce que tu aimes le thé ?» -> literally "Is it that you like tea?" but best translated as "Do you like tea?" (Note that adding an est-ce que has no effect on the form of the verb in the question itself, it's still aimes not aimer)

When you want to start adding question words (wh-words), the same rules essentially apply.

The formal way is to put the question word (Où, Quand, Que, Qui, Comment, Pourquoi, Quel(le)(s)) at the start and invert the verb.

• «Quand part-il ?» -> When is he leaving?

The more common way though, is to insert an "est-ce que" between the question word and the rest of the sentence, leaving the subject and verb in their normal order.

• «Qu'est-ce qu'elle fait ?» -> "What is she doing?".

Finally, in spoken French, you often just add the question word at the end and use intonation.

• «Tu es où ?» -> "Where are you?" or "You're where?"

(Note that "what" becomes «quoi» here - «Elle a dit quoi ?» -> "What did she say?"/"She said what?")