You want to pick a nice set of strings that you like. It's a matter of personal preference. These are D'Addario's and they're actually color coded and there's a guide on the back to figure out what string is what. You can pretty much tell yourself though because they're really thick and not thick at all. The thickest one, which is gold, is going to be the low E string. You want to thread it throw the hole on the low E string's saddle. You want to bring it up to the tuning peg you're going to put it into. I like to skip ahead one tuning peg up and cut it there.
There are different methods of doing this. You can hold it there if you want and pull it back a whole fret space there. I just do it that way. It seems to work well for me. You want to insert the end of the E string into the tuning peg, wrap it around once, pull it tight, and start tuning it up. I never worry about tuning the bass until we've got all of the strings on there.
Now I'm going to put the A string on. Feed it through the back of the bridge, go to the saddle, pull it up, skip one tuning peg, and cut it there. Insert it into the tuning peg and wrap it around once. You want to make sure that the string goes underneath where it curls at the top of the tuning peg.
Now I'm going to put the D string on. Feed it through the back of the bridge, pull it through to the saddle, bring it up, measure using an imaginary tuning peg, because there's only one more up there, cut it there, insert it into the tuner, and wrap it around once. This one you're going to want to see that underneath the string tree here keeps bridge angle correct on that string.
Now I'm going to put the G string on. Feed it through the back of the bridge, over the saddle, measure what would be two spaces, wrap it around once, and make sure it's underneath the string tree.
Now that you have your guitar all strung up you're going to want to stretch out the strings so it stays in tune. The best way to do that is really just, I like, on a bass guitar anyway, I like to grab a string and pull it up, and give it a couple of winds. Just pull it up and give it a couple of winds. You don't want to tune it up too high though. Make sure not to put too much tension on it. And the next one. Pull it one, give it a couple of winds.