As this new B772 seems to be amazing, I want to give it a try but first I would like to study all about take off speeds (V1, VR, V2), flaps configurations, landing configuration, etc before I take off.
This website gives everything from speeds to climb profiles, and not just for the 777! Just replace B772 with the IACO code of the aircraft you want (such as B752, B744, B788, etc…)
Also, for the climb to FL240, replace that with FL280, as that is where the MACH speeds start to show.
You can also get these filled in from Simbrief as well. They will provide these for you.
Additionally, In-Flight Assistant is a great app that has an autofill option in the app itself that considers weight, flaps, and other take-off configurations and spits out V1, R, and V2 speeds. I always use this along with other amazing features in the app for a fully immersive flight experience!