Reading sheet music question?

So I'm reading a piece right now and I'm a little confused because striaght off the bat E, A and B are all Flat...so everytime I see a REGULAR note on those notes I would play the flat version right?..yes unless thy have the natural note sign next to them....so heres the problem...first of all, I see a B with a flat sign next to it...so do I play A? cause tht would be double flat....and I saw a F note with a natural sign next to it...but isnt tht redundant? because it is suppose to be played naturally with no flat or sharp...Please clear that up for me ty!
 
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