LIZZY78 - here are a couple of suggestions for starting hillwalking
You'll probably like this website -
www.walkingforum.co.uk
Get the Ordnance Survey map of the area where you live, even if it's a town or city, or a fairly flat district. Then you will start to see how features are shown on a map, estimate distances, find interesting features, and make up your own routes. This will all be useful when you go to higher and more remote country. it will also enable you to judge your own fitness and capability An Explorer will show more detail, so get that for your own area, but a Landranger is OK once you've got used to hiking
This is a good supplier for maps -
www.dash4it.co.uk
Most towns have odd historic features, like old houses, churches, and pubs; why not do a walk to see them; you've probably known about them for years but never got round to it; now's your chance!
Search YouTube for 'starting hiking' and 'starting hillwalking' As with many things on YT, the videos might not be exactly what you want and/or might be American, but it is all useful homework
Start out easy and take plenty of food including sweets, biscuits, & chocolate in case you get hypos. In fact this will probably help you to recognise the onset of a hypo. Info & advice on what to wear is easy to find, but a hot drink is a good idea for this time of the year
You could take a meter and test to see how your blood glucose drops with distance & exercise
I was diagnosed 20 years ago and still go hiking & backpacking.