Do I need to check for connections between you and CM?

Sounds like you'll be able to push Nigee in a few weeks.

STRETCH THEM LEGS
The following guide depends on your age, level of current fitness, ect, but this should be an okay guideline.
Note: when running, a good way to measure your pace (esp if you're really out of shape/inexperienced): run at a pace where you could talk moderately, but cannot sing.

I'd suggest going out for 20-40min/day (4-5 days/week) for the first 3 weeks.
40-60min/day (4-5days/week) for the next 5 weeks
solid 60-70 min/day (5 days/week) for the next 3 weeks
Last week: 40min on days 1 and 2, 30min on the next few days
DAY BEFORE RACE: 20min easy run, then stretch like hell.
Stretching is the most important thing to do to prepare for this!!! Stretch quads, hamstrings, calves, hip flexors, groin, and glutes.

---------WHENEVER DOING A WORKOUT----------
1. jog for 10 min or so
2. stretch everything, should take 5min or so
3. run
4. cool down after running by jogging for 5 min
5. stretch immediately after cooling down for a good 10 min

This should work for a person between 15 and 40 who is in halfway decent shape.

Use a wheelchair and fill it with items equal to the weight of the person for practice. That way you don't get distracted with complaints as you hit bumps as you build up stamina.

Hold your own drag races at local senior centers and hospitals.

You may need to expand your radius to accommodate for more locations as each place kicks you out.

@abge: yup.
@grking: thanks.
@everyone: No offence to grking, but could anyone give a second opinion there? Do any changes/doubts come to mind?
@Randomizer: noted :-)

Also @grking: does it matter whether all time for one day is in one run or not?

All time in one run would be better. If you don't have a solid hour and a half in your schedule, you can split the longer 60 and 70 min runs into 2 30-40 min runs.

I also forgot this in my earlier post: if you don't have a pair of new running shoes, go out and get one. I don't know where you live, but in my town, there is a place where the staff of a shoe store will watch you run a little, then figure out the best show for your foot.

*shoe, sorry
Also, I agree with Random. If you can find a wheelchair, take one or two days out of the week and run with that. Increase the weight over a few weeks to ease yourself into it.

Yeah getting proper running shoes is definitely on the to-do list.. I do pDamn why am I so busy lately :-)
Thanks for the advice so far.

I've noticed that my endurance is quite.. volatile. It's mostly dependent on how much pain I feel in my legs, so breathing is not a problem, which is quite ironic since I have astma.
I guess I have two questions: how do I make sure I don't get sport injuries/too much pain and at what point should I stop (like, as soon as I feel slight discomfort, when the pain gets too much to bear or somewhere inbetween)?

Don't know where "I do p" in the second line comes from, I blame my mobile for sure.

The current 'bad' condition my legs are in is presumably not caused by running but by PE at school, btw.

Injuries are different for everyone. If you know a sports medicine specialist, physical trainer, running coach, or even an older, more experienced runner, definitely ask them. Once you really get running and become more familiar with your body, you will be able to tell if a pain in your leg is normal or serious.
To prevent injuries: warm up before working out, cool down after working out, and never forget to stretch. Also, try to stay light on your feet and take smaller steps, as runners who have large strides and land heavily on their feet tend to get injured more. The amount of pain to tolerate before stopping varies person to person, and it really depends on what kind of pain you feel and where you feel it.

(I said older runner because they usually have to deal with more injuries than younger ones)