Which among these language items would you start with when teaching and why,VERBS,NOUNS,ADJECTIVES,ADVERBS or PRONOUNS?

Verbs initially as they are "doing" words and a direct lead into tenses. Everything revolves round verbs.

i don t have a clue

I'll start with Noun and Pronoun with a little idea of adjectives and then verb because 'teaching how to make a sentence' subject and verb go together. without learning Noun and pronoun, rule of subject - verb agreement won't be possible. Therefore,in my view, for the correct use of verb, one must understand the noun and pronoun i.e. subject.

I tatrt with them together , I may ignore adverb and adjective because they are not main elements in the sentence.

Together. In speech