Chopin Prelude no. 4 - Notation Problem.

[oceansoul]

Greetings. The thing is I don't have a teacher, so I have to guide myself through whatever resources I find. And you guys here are very helpful.

I've searched a lot for this, but I couldn't find anything.
So, i'll tell you my doubts:
 - Doubt Number 1 - What's this?
 - Doubt Number 2 - What's this?

I know that after those two A#, the G shouldn't be played yet. What am I suppose to play before the G where those notations are?

Thanks in advance,
      OceanSoul.

[wotgoplunk]

Your doubt #1 is a turn, which is a form of ornament. The screenshot you posted has the turn over the note, however my edition has the turn between the two. Regardless of which you prefer, a turn is playing the note above followed by the note itself, then the note below, and then the principal note again. If the turn between the notes you play it using the preceding note, if on the note you use the note it is over.

Your doubt #2 is a double sharp, which is where you raise the note by two semitones, as in with a regular sharp.

Hope that's not too hard to follow

[oceansoul]

Thanks, wotgoplunk. 
I didn't get into it very well, but thanks to you I found out a place to read about ornaments. I've always had problems with ornaments. I didn't know they were ornaments, so I couldn't find anything helpful. Thank you.

Just in case someone else has problems with ornaments, here goes a wiki:
https://en.wikipedia.org/wiki/Ornament_(music)

Goodbye for now,
     OceanSoul.