Building a base on the moon would take substantial amounts of money and resources not to mention the governments of the world banding together to make it happen. The cost to send a capsule and gear to the moon just a few times cost our nation $25.4 billion in 1973. Now imagine having to send multiple loads of gear, water, resources, vehicles and construction equipment. It would cost trillions of dollars not to mention any lives that may be lost trying to get the stuff to the moon.
Can we do it? The answer is YES! Will we do it? YES!! It is just going to take time. We will return to the moon to harvest something very special that exists on the moon called Helium 3. H3 is made in the Sun and it collects on the surface of the moon because it has no atmosphere. So over the eons it has been trapped on the moon untouched.
Why do we want H3? Well it is a highly abundant fuel source for fission. There is enough on the moon to solve all the power problems we have on Earth. So the first major colony won't be put in place by the powers that be but a private mining industry. They will bore underground and create subterranean bases inside large craters. A H2O plant at the south pole will melt permafrost into useable water and pump the water to the mining bases.
Over time the entire project will pay for itself. We are going back but not as explorers but as plunderers.