read more on the mcedit page you obviously went to. http://khroki.github.io/MCEdit-Unified/ get the 32 bit version
my personal suggestion is ubuntu or mint for noob linux users. fedora is cool but takes the "everything and the kitchen" sink approach. options on how to go about it depend on what OS you currently are running. the instructions are very different if you have win8 versus xp or vista.
standard non-win8 instructions: 1 get a linux distribution from one of the 2 links above. goto page, click download tab near top of page, select 64bit version, (get codecs version) 2 put the install files you just downloaded onto a dvd or flashdrive(more instructions) and put it into your disk drive then shut down 3 boot up your pc with boot from cd/dvd option in bios put before boot from hdd. 4 follow instructions to install the distro. select 'install alongside windows' option when installing for either. if you don't know how to install OS's onto a comp it will be quite the adventure most likely. I suggest you backup everything onto a portable hdd or something. if you have win8 I suggest not trying as you will likely screw you comp up trying to disable the secure boot BS while installing. the installation programs will let you format your partitions while you still haven't set things up to let you install properly, thus leaving you with no OS and the install not working.and after you go through the trouble of installing a linux OS to get a 64 bit OS you will find it very difficult to get many windows programs working with wine anyway. since there arent as many useful linux specific programs for much of what you want to do.