The 50 1.8 is not actually a macro lens, it won't give you true macro but I wouldn't be surprised if you can something close to the second photo ([link]). The 100 2.8 is actually designed for Sony Alpha DSLRs/SLTs if I'm not mistaken, you could get an adapter but what you may want to take a look at is this: [link] I believe it's the only Nex macro lens and does offer 1:1 magnification. The focal length and aperture are different from most macro lenses I've seen but you may want to check it out.
Also, I really don't mind questions I love to get them from people that will listen (which you are ) so don't worry about it ask as many as you like!
And for an adapter it's hard to say, but honestly despite the expense you may shoot for the Sony adapter itself (Sony Alpha LAEA1: [link]) not to be an OEM fanboy but why not get what the manufacturer designed, considering you're getting a simple piece of equipment yet if it doesn't work you're...well, screwed
However, that being said, it's many times more expensive than third party adapters I simply don't know how well they will work.
Doing a search on Amazon or Google like 'Sony Alpha to Nex Adapter' will turn up many results, I have little experience with adapters so I cannot for sure tell you but that's what I'd say
XD thats good then~ And I think I might check out some adapters at a camera store first (try and see if they'll let me try them on my camera) if not, then I will invest in that one, to be on the safe side. (I don't trust third party companies much)
And yea that's an excellent plan, I am not comfortable recommending a third party adapter with no experience as you have a chance to mess the mount of the camera or lens up, but if you try it out you should be good