I am waiting here now (casually): ここに待ってる (koko ni matte ru)
I am waiting here now (politely): ここに待っています (koko ni matte imasu)
I will wait here (casually): ここに待つ (koko ni matsu)
I will wait here (politely): ここに待ちます (koko ni machimasu)
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"I will wait":
待ちます "Machimasu"
待つ "Matsu"
"You will wait":
あなたは待ちます "Anata wa machimasu"
あなたは待つ "Anata wa matsu"
to say "will wait for you no matter what" is: Ni kankei naku, nani o omachi shite orimasu. I hope that this helps!
You can say "chotto matte kudasai" [一寸待って下さい] or "chotto matsu" [一寸待つ]
Both are pretty formal.