No reason to worry. The few discolorations are due to soma minor physical damage that occurred during handling and delivery. Only artificial plants are without flaws or blemishes!
Give your Mass Cane as much light as possible but keep it beyond the reach of the direct rays of the sun. It does quite well in moderately low light but not in a dim corner or many feet away from the nearest window.
The way it is now double-potted is the way it should be kept. It should never be taken out of its plastic nursery pot and repotted. You can put some Spanish moss over the top to disguise the inner pot to make it look more finished. But leave the soil and roots undisturbed.
This is a plant that grows very slowly indoors and does not use much water. Always allow the top 2 inches of soil to get dry before you water it. That may take a couple of weeks, but letting the soil dry out properly is very important.
It does not need misting or fertilizer. Try not to do too much for this plant because it is low maintenance and does not need fussing over.
Some older lower leaves will turn yellow/brown periodically, but that is normal aging. Such leaves can be removed to make the plant look nicer.