What a fabulous problem to have, Louise! It does look a lot, and you might find it best to cultivate part of it. But what a wonderful retreat when the weather is not great, with plenty of room to create a place to sit and maybe somewhere to study the gardening books and lake notes, plant seeds and pot on, as well as storage. A gardener's heaven, in fact! I wish you the best with it. If you get the gardening bug, you'll have a lovely time in there. I'm so jealous! With all that space, too, you might find a neighbouring gardener who would be only too glad to help in exchange for the use of some of that space. Sadly, I'm too far away!
wow what a fantastic poly tunnel your so lucky! i would start to clear it a bit at a time by just digging over and removing weeds.Or you could use weedkiller on it all.Once cleared you could maybe concentrate on a small area and cover the rest with black plastic or old carpet to stop weeds growing.As its so big it may be too much to use all the space this first year if your new to gardening. Salad crops are easy for a beginer Lettuce and raddish ect.The ouside beds look like they could be rasberrys,but cant realy tell a close up photo might show then better.Once you start you will get the bug good luck and keep us up to date .
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What a fabulous problem to have, Louise! It does look a lot, and you might find it best to cultivate part of it. But what a wonderful retreat when the weather is not great, with plenty of room to create a place to sit and maybe somewhere to study the gardening books and lake notes, plant seeds and pot on, as well as storage. A gardener's heaven, in fact! I wish you the best with it. If you get the gardening bug, you'll have a lovely time in there. I'm so jealous! With all that space, too, you might find a neighbouring gardener who would be only too glad to help in exchange for the use of some of that space.
Sadly, I'm too far away! 
wow what a fantastic poly tunnel your so lucky! i would start to clear it a bit at a time by just digging over and removing weeds.Or you could use weedkiller on it all.Once cleared you could maybe concentrate on a small area and cover the rest with black plastic or old carpet to stop weeds growing.As its so big it may be too much to use all the space this first year if your new to gardening. Salad crops are easy for a beginer Lettuce and raddish ect.The ouside beds look like they could be rasberrys,but cant realy tell a close up photo might show then better.Once you start you will get the bug
good luck and keep us up to date .
Lo5; what a great garden, it will be so much fun getting it up and running