It means "hello". Mind though that it is not used as the standard greeting phrase, but is instead used in expected scenarios, such as in a phone call where you often know who the other part is. Contained within the phrase is an underlying rule of the answerer adding the "ja" to the "hallo/hallå", as if he/she has already talked to the person before. A comparison might be "hello you".
"Am" as in "I am" is "är" in Swedish.
Du means you in Swedish.
Har means has in Swedish.
It means Mr in Swedish.
Camilla doesn't mean anything in Swedish, it's just a name (for women). It's not of Swedish origin.
Neah doesn't mean anything in Swedish, but it might be a name?
It's an English name... It doesn't mean anything in Swedish.
"Söt" means "cute" in Swedish.
"stad" means city in Swedish.
It's not a Swedish word.
Nothing, there's no such word in Swedish.
Froken means Miss in Swedish.