The best way is the way that works best for you.
Apologies if that is not what you wanted to hear, but it's simply the truth. People telling you to build a nuclear reactor won't help if you don't have any uranium. People telling you to build a steam turbine won't help if you don't have a steam boiler and the fuel to run it. People telling you to build solar panels won't help you if you're playing with the Mindcrack pack because you need a ton of infrastructure to build the adjusted recipe there.
Now, if you're just looking for a way that works well, we can help you better. First things first though, you need to pay attention to which machines you are building and which mod they are coming from. That is because different mods use different kinds of energy, and your attempts to fuel Buildcraft compatible machines like the pulverizer with Industrialcraft power from a MFE will fail.
To power your pulverizer, try building a hobbyist's steam engine and placing it directly next to the pulverizer. Then give it coal and water, and apply a redstone signal (lever or redstone torch next to the engine). It should begin burning coal and gain temperature and, once above 100°C, it will start turning water into steam and begin to move. It will reach top speed after 2-3 minutes. For storage, the pulverizer has an internal energy buffer, but there is no early-game storage device for Buildcraft power. Later on you will be able to build redstone energy cells, though, which do exactly that.