"What is your address?"
Translation:Quelle est ton adresse ?
"Adresse" is a feminine noun, hence the "quelle". However, in order to have a more pleasing sound and avoid a vowel/vowel guttural stop, French replaces the feminine possessive pronouns (ma, ta, sa) with masculine ones (mon, ton, son) when the noun starts with a vowel.
Ton adresse, mon amie, son enveloppe, etc.
Sorry, no. You can't use "qu'est-ce que c'est" for this type of question. Think of the "est-ce que" part as "is it that." Using that construction it would be "(What) is it that that is your address" which doesn't work in French (or English!).
"Quelle est ton/votre adresse ?" is the way to ask this question in French.
To begin with, "quoi" never starts a sentence in good French.
Secondly, when asking a question that is connected to a noun, "quelle (est ton) adresse" or "which/what (is your) address," the quelle is acting as an adjective. Which/what thing/person. Since quel(les) is an adjective, it will agree in number and gender with the noun. Quoi is a pronoun and does not form agreements.
Quel est ton acteur préféré ?
Quels livres sont les vôtres ?
Quelles filles aiment danser ?