Hi Daniel,
I started running in September mainly because it was getting a bit too dangerous for my liking to out cycling in the dark- don't get me wrong I used to cycle about Glasgow in all weather and lighting conditions but now I've got a family I'm a bit more wary.
Anyhoo, when I first started running I did 3 mile, then 5 mile runs. By October I had increased it to 8 mile runs during the week and by the end of the month was running 13 miles on a Sunday. However, I felt really tired right through to Tuesday so cut it back down to 8 miles and started hitting personal bests everytime I went out.
At the moment I run 10 miles twice during the week, play 5 aside on a Friday and run 13 miles on a Sunday. I've signed up for the Ed marathon at the end of May so I plan on increasing my Sunday run by 2.5 miles every 2 weeks until the end of April before tapering down a little in prep for the marathon.
So, the things that helped me maintain my motivation etc were:
1) Finding a route that I can easily add miles to. I live in East Kilbride and have a route that is 2.5 miles long which lets me build up my milleage in a kind of controlled way if you know what I mean.
2) Decent pair of trainers and comfy outfit for running in. I wear a headband too- I know, fashion suicide- but it keeps the wind and rain out of my ears and keeps my headphones in.
3) Samsung phone with endomondo app to count miles, speed etc and record personal bests- great help for motivation!
4) Spotify. The lift I get when a song comes on that gets me back in the 'zone' is indescribable.
5) Always surprising myself by the miles I can run. I've never been particularly fit apart from the usual playing football etc, so I'm in a permanent state of surprise that I can actually run that far!
But at the end of the day all you need is a pair of trainers.
Good luck with the half marathon when it comes!