Just restarting and need HELP, please

Hi. I am just starting back to swimming after a 20 year image problem related absence. I am having a hard time figuring out a workout that is something I can accomplish. I can do all strokes, except butterfly. This week I started swimming 1900 yds everyday. I am not swimming it all at once, but trying to do sets. For example, today I swam: 1x200 fr, 1x100 ***, 10x25 fr alternating fists and trying to sprint!!!, 5x50 br. 1 normal, 1 no kick, 1 no pull, and 1 normal, 1x200 fr. alt breathing and fists, 4x50 alt. br. and back, 3x100 fr. 1 normal, 1 fists, 1 normal, and practicing alt breathing, 4x50 br., and 4x50 free. All were seperated by 5-20 sec. rest. I would like to be able to shave serious time off of a 50 ***, which I am now swimming at (yikes!) 55 sec. I would also like to gain some abliity to not breath CONSTANTLY!!! Also, when you are doing your underwater bit in the free, are you supposed to be breathing out? I seem to make many bubbles that others don't. I have been reading the posts on the discussion boards for a week or so now, and you all seem to be very knowledgable and helpful. If anyone can offer a suggestion or two, I would be very thankful. Thanks