YOU SAID:

I have no idea what to do

INTO JAPANESE

私は何をするか見当します。

BACK INTO ENGLISH

What to do I guess.

INTO JAPANESE

私は何をすると思います。

BACK INTO ENGLISH

I think what I will do.

INTO JAPANESE

どうなるかと思います。

BACK INTO ENGLISH

I think what will happen.

INTO JAPANESE

私は何が起こるかと思います。

BACK INTO ENGLISH

I think what happens is I.

INTO JAPANESE

私は、何が起こるかと思います。

BACK INTO ENGLISH

I think what happens is I.