Block Man was designed to be the introductory stage for most players. The combat is not as difficult as later stages, but there are some tricky platforming sequences if you’re just getting acclimated (or reacclimated) to Mega Man’s controls. It’s also a great stage for teaching yourself to use the Speed Gear often.
Just remember to go at your own pace and try to remain calm. Console controllers and televisions are a lot more expensive than they used to be!