Hi and Welcome to the forum
@GSDLOVER2020 - Its a shock isnt it. It may be helpful if you can let us know what Hb1Ac level you had and if you are taking any meds? This will help others tailor a suitable response for you - I would say, dont panic, nothing will happen straight away - Take your time (and a deep breath) and just give yourself a moment to absorb it all.
I would suggest this letter from the site - its long but worth reading.
Maggie Davey's letter
You will have many question im sure. The main thing to remember is diabetes is a very individual thing. What food suits one person may not necessarily suit another - but you will find your own path. There's loads of resources on here, lots to read and take in.
For a start, you will need to reduce your sugar/carb intake. Not just the obvious sugars but the hidden one's too, in things like ketchup/sauces. Getting used to reading labels on food for 'total' carbs is vital. reducing things like potatoes, pasta, rice, and wheat products found in cakes, pastries, pies etc. Its going to be a whole new way of eating, but you will acclimatise. Perhaps upping your exercise regime will be required. With a few tweaks to things you can be fit and well. It just takes a little organising and some determination. You can control this very well if you put the work in.
Let us know any questions you have, someone will be along to help you - all the best.