Quick answer
Я здесь.
ya zdyes — two words, and no verb needed
The options
No verb
Russian has no present tense of быть, so Я здесь is a complete sentence. Adding есть would be archaic. The same applies to Он до́ма, Мы на ме́сте and Все тут.
Arrived, on foot or by transport
Я пришёл / пришла́ — I came on foot. Я прие́хал / прие́хала — I came by transport. The choice between them is the same motion-verb logic as иду́ and е́ду, and Russians do notice it.
What you hear back
Typical mistakes
Я есть здесь.
Я здесь.
No “am” in the Russian present.
Я прие́хал — after walking
Я пришёл.
On foot takes прийти́.
Check yourself
Which is correct?