Yes, but you can also use intonation. Just like in English, if you raise the pitch of your voice at the end of a sentence, it denotes a question. However, the course does not base questions like that yet. (You can think of it like Qu'est-ce que... in French for this scenario, as it doesn't have an emphasis on the regular meaning 'what')
When "kyaa" is the first letter in a sentence, do NOT think of it as "what." In this case, kyaa simply signifies that this is a yes/no question. So if you have the base sentence वह तेरे घर में है (He is in your house), which is just a statement, kyaa makes the statement a question.
If you're confused about word order, remember that Hindi's word order is different than English's, which goes SVO (Subject-verb-object). Hindi is SOV (Subject-object-verb), so तेरे घर में comes before है.
Hope this helps!
Well... Latin has no real word order. It is free, only rules are:
prepositions go before the noun
Adjectives and possessive pronouns have to stand next to the Noun
But something else I figured is maybe a help for Hindi-learners, who know Latin:
A sentence-initial क्या would be the suffix -ne in Latin. it turns a statement into a question.