It looks like you are using an ad blocker. That's okay. Who doesn't? But without advertising revenue, we can't keep making this site awesome. Click the link below for instructions on disabling adblock.
you can either pay for imovie on your iphone, its kinda tricky to edit and stuff though. or you can just plug the phone in as if you're syncing it, sync the movies onto your desktop and then upload those into your editing software, like imovie on apple computers.
WMM is definitely the best program to start on...You can still make great edits with slow motion and what not. By far the easiest program to start with. Plus, its free with a windows computer. Now if you are more excelled with editing go with adobe. Hope that helps!