Few Questions about iPhoto to Aperture Switch

I have been using iPhoto every since I got a mac. I store all my photos (I am an amateur photographer so I have a lot) in iPhoto and I have iPhoto synced with my iPhone over iCloud.

iPhoto is great, but I have been dying to get to Aperture cause of its vastly greater capabilites.

Here is my dilemna. I want to use Aperture, but not if when I move my iPhoto library over to Aperture any changes I make to the photos in Aperture won't be automatically seen in those photos in iPhoto.

And here is the bigger issue. If I do switch over, that will take up so much MORE space on my harddrive. Is it possible to work out of Aperture and have the files be saved automatically in iPhoto so I don't have all these duplicate files taking up twice the ammount of space that is necessary.

Lastly, and this is more of a iPhoto question, but if I have a Macbook Pro and an iMac, how do I get the two libraries to be identical. Right now I have to manually upload the same photos or do it over the Airdrop because they are right next to each other. They are both on the iCloud together, but if I were to make a change to a photo on the laptop, how do I get it to be already there on the iMac.

I appreciate any help in these matters, and I thank you ahead of time.

Yours truly,

Brendan