As for editing on a tablet/ mobile, I recommend an app called Splice, for IPhone (also available on IPad), I've tried my fair share of editing apps, trust me, and this is way up there with the best of the best.

It's clean cut, easy to use, and has the most features for any free editing app I've ever seen.

To use it, there is a long set of tutorials, and I think it's really quite obvious anyway.

HOWEVER! Splice does take up a lot of storage (around 300mb), which can be quite inconvenient.

However if you don't like Splice, here's some other apps that are quite good:

Video Editor For Free - Im not a big fan of this one, I find it difficult to use and don't like the way it operates.

Cute Cut - I do like cute cut, it took me a while to get to grips with it though. It really does take a bit of getting used to, but I think it's quite good. HOWEVER! Cute cut only let's you download/upload 30 seconds at a time, which sucks and really slows down the process. But what I do is I get the first thirty seconds, then delete that and shuffle it along, and generally end up with three thirty second chunks which I then use splice or Video Editor to put together.

Perfect Video - I don't really have much experience with this one, but it seems quite nice, clean cut, good quality, I can't complain. I just don't use it.