Second, how to install banana plugs for speaker wires without cutting the wires with wire cutters since I don't have tools like that? And how many orders of banana plugs should buy and where is a good place to buy them?
And thank you!
Monoprice and Parts Express are good places to buy wires. You can also buy wire at hardware stores and electronics supply stores in your area. You should be able to get wire for less than $1 per foot. Before you buy anything, though, make sure you are buying a big enough gauge. Here is a site with a chart:
It is worth reading the whole page to know why you don't need to spend a lot on wire.
You can buy wire cutters and strippers quite cheaply at the above-mentioned places, so that will not increase your cost very much. Now, if you do not want to cut or strip wires, and you want them with banana plugs (which are nice, but not essential) you should buy wires with banana plugs already attached, if you can find them long enough for your purposes (and of course, with plugs will cost more than without).
A company like Blue Jeans Cables will make custom lengths for you. 40 feet of their Beldon 5000UE 12 gauge wire with locking banana plugs at each end currently run $50.75 each.
You need to plug in the length for the "terminated" cables at:
A local store might do the same for you, or they might not. You would have to ask them.
Some questions for you now. Do you really want such long speaker wires? You could have the speakers about 80 feet apart with such wires; is your bedroom really that big?