I am that man currently in Thailand having done over 30,000 miles so far. Tips: top loading panniers for the ability to load and strap things on. Large bag on the rear instead of top case as you can carry more and it keeps the weight low. Once you’ve packed everything empty it all out and throw half of it away. You end up rotating the same 3 T shirts and pants & socks, washing out as you go. Booking.com will get you a hotel anywhere and get a universal adaptor for usb/plugs. Fitted a stronger rear shock for the extra weight, and layers for the bike clothing. Have a pair of vented summer gloves and a waterproof set.
Good boots in case you come off (we did), and don’t skip on good helmets with comms setup. Fitted Sat Nav and use google maps on my phone for those hard to find hotels. Look at getting visas in advance if you can as it will save a lot of hassle later, but some you can only buy within a short time period of arrival, so be prepared to hang around a bit. Get good medical cover, an International Driving Permit, and look at the costs of getting your bike through countries without paying import tax. We have a Carnet from a company called CARS, but check what will apply to you if you plan to keep the bike once you get back. Your UK bike insurance will cover you some of the way,then look to buy online or at a border for a month at a time. Join Horizons Unlimited site for up to date info on border crossings etc, and the UK government has a site you can join for updates overseas.. and ENJOY!