Go for it now. The future is promised to no one.
The secret of getting ahead is getting started.
Always desire to learn something useful.
Expect problems and eat them for breakfast.
If you've got a talent, protect it.
If you're going through hell, keep going.
Be gentle to all and stern with yourself.
You never know what motivates you.
Only the educated are free.
The most effective way to do it, is to do it.
I believe you'll develop speed via strength work which includes hill running, either repeats, or running hilly courses as the Kenyans do on a steady basis.