Rebelyell, that is brilliant! I did the coach to 5k last year and can give the following advice,
Always warm up before with brisk walking, and do lots of stretching after. Never run two days in a row as your body needs time to recover.
Don't try to run too fast in the beginning as this could cause an injury, it is not about speed just about keeping a sustained even pace and speed will come later.
Have a warm bath after and make use of sports rub if you have achy limbs, which is very likely to happen. Also keep well hydrated by drinking lots of water.
I did the 5 to 10k course this year as I have enjoyed running and at the moment I have a knee injury but I am so anxious to get back running but been told by my physio to not run for 10 days.
Good luck to you and just remember you are doing so well just getting out there and exercising!