There's a lot of suggestions to weed through in this thread. Here's my advice as a whole for a new participant in this hobby... "Buy what you can afford." "Buy once, cry once." "Only you can answer these questions, but first through dedicated research."
Most [of us] enthusiast in this hobby start out with 'small' purchases then buy better guns and gear as we evolve. A well thought out plan will limit the amount of "extra" gear collecting dust. That said, with air consumption (and storage) try to first determine your initial needs, and try to imagine where you are going to be with them in the near future. To start, I'd suggest...
Buy a quality but inexpensive four stage hand pump and air filter to start. If you find that you need more air and do want an electric pump then you will have the hand pump as backup in case of power outages.
I have just recently asked the forum about the "best" options for a decent hand pump, (for standby for me in times of power outage). I was given multiple responses from multiple authority on hand pumping. Most suggested getting an affordable Four Uncle's or similar brand of four stage pump off Amazon instead of the "expensive" name-branded pump, and to keep them maintained (clean and oiled) so they work well.
An included purchase with any type of pump is investing in a good air filter to run inline with the air hose and gun cylinder or air tank. They are an essential requirement to prevent moisture and failure.
If you can, I'd suggest buying an affordable and appropriately sized 4,500 psi scba tank (to initially get pumped up at a scuba shop) and add stored air into with the hand pump. You will use this tank to fill the gun from. Hand pumping the tank and using it to fill the gun to optimal pressure will prevent the build up of moisture in the gun's air cylinder and it will keep you with additional backup air when you do not want to run that hand pump.
In the end if you find that you don't like the workout the hand pumps give you, then an electric pump will definitely be your next purchase. And the trusty hand pump will be there in case of emergency. The scba tank will be there still in use to fill the gun. Ultimately, the potentially priceless hand pump won't cost too much just sitting in the corner.