The Great Manchester Run is in May next year so you've got a fair chunk of time to build up to it which is good. Most pre-prepared plans seem to be in the 12-17 weeks region which would leave you with about the same period again to building up the mileage gradually.
I was thinking off doing the b marathon program which is 16 weeks and doing each week twice
How many times a week do you run already?
2 - 3 times a week, i'm going to borrow my prents treadmill so i can do some when the kids are in bed so hopefully can bring this number up a bit. Do you have a particular aim/time in mind for your first half marathon?
For the first time I just want to complete it really without having to top.Have you signed up to any tune-up races - you don't have to of course but they can give you an idea of your current level of fitness and what sort of pacing you might need to be looking at?
Only timed running I have done is the park run. There is a few 5/10k and half marathon races locally in December Do you have a pair of good trainers that are comfortable/fitted?
Yup
wentu p to pete bland sports and got some fitted. And do you have a pair that you will use for the run - if so make sure you've used them a few times for longish runs, what feels fine for a short run might not be so good when the miles get higher and you want to be comfortable with the trainers.
As general advice I'd be looking at building up the mileage gradually, there's a notional 10% max that has been floating about but it's a very crude metric because everyone is different - it's probably not too bad to bear in mind as a relative beginner though. As a start then miles/time on your feet will be important rather than trying to run to a specific pace and indeed running at a slow/comfortable pace is going to be both beneficial and less likely to cause injury than always trying to set a new PB. Remember rest days are important because that's when your body repairs. To that end also try to incorporate some stretching/foam rolling at the end of your runs, it'll help with recovery. Try to eat reasonably well and on longer runs you might want to start practicing fuelling e.g. drinking water and/or taking on energy gels/food because come race day you don't want to be trying them for the first time.
I've not done this yet but something to try Have you practiced with the kit you'll be wearing?
I'm un-prepared here! I just run in my united football shirt and shorts and some running socks You might discover that it's great up to a point then at mile 10 causes chafing and you'll either want to replace the kit or find a strategy to deal with it. Some people find joining a running club helpful but others just don't like the idea - maybe give it some consideration as it can help encourage you to keep training consistently if that's something you struggle with. Just a few of my not entirely coherent thoughts as they occur.