Welcome to the forum.
With all the blather about the DVLA screwing up what’s on people’s licenses, I’d check the entitlement to ride a motorcycle is still on your licence, if it isn’t, save time and effort by retraining with a local school and redo the tests, unless you have cast iron proof you previously passed a test the DVLA won’t give it back.
Next get yourself a a cheap mid sized hack and get a few miles in before you consider a massive global munching adventure bike.
Go to your preferred marques local dealer and test ride a range of machines before spending large wads.
If you need read some inspirational books, Ted Simons whilst a great read was riding an ancient Triumph, Lois Pryce rides an impossibly small Serow, there are books and blogs and YouTube’s and an and an and... for every combination of machine, route and rider.
There are plenty on here who have ridden a good deal further than Turkey, some of us extensively in Europe, far more haven’t left the UK, but there’s a wide variety of experiences, most will not matter a jot to you.
Above all be safe and enjoy.