The problem with answering these questions is the lack of information about you. Age, fitness etc and even then it might take a book to answer in sufficient depth, but I'll start things off.
how long do i run for? As long as you can isn't an unreasonable answer, but you might be better with run/walk ie run a minute walk for 2 after a week or 2 you might run for 2 and walk for 1. Gradually building up until you can run at a speed that means you can still hold a conversation.
What do i need to eat before and after running? Depends when you run. If I run at 6am, nothing, 8am coffee, 10 am porridge (at 8 am). Something light an hour or 2 before you run.
how long before running should i eat? as above
Where is the most important part of your body to stretch? Don't really know enough; I do calves, quads and hamstrings after a run.
how do i know if i start off too quick? You won't be able to talk.
What is the best time to run at?( i have been told in the morning or at night). Personal choice. Morning or night at the moment while it's hot. In winter I run between 12 and 4pm while its light.
What time should i be aiming for? Depends on you, whatever time you do while being able to talk is what you should aim for.
