How would i say these...

1.) "Genki desu ka?" 元気ですか？: Means "you healthy?" but the context means "how are you?" (informal), "Nani ka(atta)" 何かあった？?: a closer translation from "what's up" would be this, though. Very informal though :)

2.) "Hajimemashite" はじめまして: Means "good to see/meet you", or if you haven't spoken or seen to someone in a long time,"hisashiburi desu" 久しぶりです

3.) This one is hard to translate as there is no "literal" translation.. Instead, what's commonly used is "aitai" 会いたい: I want to see you.

4.) Not sure what you mean here, but if you mean it in a way like "whatever" as in "what ever", I believe "ikaga" 如何 would be the right term.

Of course my Japanese sucks, I did what I can to help, I was never really raised having to read characters that aren't Roman someone please correct me if I'm wrong with anything.

Uninstall said:

4.) Not sure what you mean here, but if you mean it in a way like "whatever" as in "what ever", I believe "ikaga" 如何 would be the right term.

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This is generally used in questions (i.e. いかがいたしますか？--what would you like to do).

More proper phrase would be
どうでもいい doudemo ii
or if it relates to a physical material
どれでもいい doredemo ii

Sorry for bringing this back up, I don't know if this is still relevant to you but you can also use

"調子は同大？" (Choshi wa doudai?)
"調子はどうだ？" (Choushi wa douda?)
"調子はどう？" (Choushi wa dou?)

to ask "What's up?"

But I think it seems more fitting like to ask "What's good?"