Should I use miles or kilometres? I see lots of u guys using that and even though it is inferior it might be better to fit in.
Both. I usually use Miles, but I've been trying to incorporate kilos for races so that there are more places to mark pace.
Also, for your post on the running thing, I would recommend against it, as those kinds of machines train for biking-like events and not running. You might struggle a lot when you actually go and do a race. I recommend just going outside somewhere that has a lot of space and doing your run.
Also, for people who don't do team running sports and just run for fun, here are some tips:
1. You are going to have some hard days. There's no way around it. You just gotta get through the run and tough it out. It'll make you better and feel better in the long run.
2. Know when to run hard and to run easy. If you want to run fast, save one day a week to do your speed workout (tempo, where you run slightly faster pace than your distance pace; Fartlek "speed play" in Swedish, where you run at race pace for some time and run at a slogging pace to recover; kind of like intervals, where you run fast for a distance, rest, then do it again for several reps; or race day, where you run at your race pace for the distance you are doing). For easy days, it should be your distance pace, or even slightly slower than that. That's when you usually recover from a hard workout or a race the day before.
3. MAKE SURE TO WARM UP AND STRETCH! Seriously, you could get really injured from not doing the proper warm-up and stretching. For warm-ups, I usually do dynamics like high knees, butt kickers, grapevines, and skips. I'll post my warm-up and stretching routine whenever.
4. Finally, take care of your body. Another number of injuries come from not taking the proper necessities you need before and after the workout.
-Make sure to drink plenty of water before, during, after, and pretty much during the day.
-Eat plenty of food and get all your nutrients, although don't eat like 2+ hours before you run. A small snack an hour before the run might be okay if you are really feeling it, but it's not recommended if your body can't handle stuff like that.
-Get plenty of sleep. You do better, it's just common sense.
-Listen to your body for injuries, and tell someone (a coach, parent, school nurse, etc.) if you feel like something is wrong.
That's for running advice. I'll end up posting my warm-up and stretching in some time, but if you have more tips, reply to this message.