Ordering a coffee: Choice of bean which can vary by origin, roast type, or blend.

💬 [何] is often read [なに], but before certain particles it often becomes [なん]. For example, [何を] is usually said [なにを], but [何ですか] is [なんですか].

💬 [注文] becomes the verb "to order" when you add [する]: [注文する]. You'll also hear it in polite forms like [注文します] or [注文されますか].

💬 [〜されますか] is a polite way to ask what someone will do, and here it softens [注文する] into a customer-facing question. You can reuse it with other verbs too: [何を飲まれますか？] for "What would you like to drink?".

💬 [欲しい] is used for wanting a thing, not for wanting to do an action. So [コーヒーが欲しいです] is natural, but for "I want to drink coffee" you'd say [コーヒーを飲みたいです].

💬 With [欲しい], the thing you want usually takes [が], not [を]: [コーヒーが欲しいです]. The same pattern works with other things too, like [水が欲しいです].

💬 [どんな] needs a noun after it: [どんな種類], [どんなコーヒー], [どんな味]. If you want to ask "which one?" by itself, use [どれ] or [どちら] instead.