Need a little internet help

Are you asking about the physical act of pulling wire, or what gear you should buy after pulling the wire?

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I dont know if I should be pulling individual cables from my router to each location.

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Generally yes, you'll be doing "home runs" to each location. Though depending on your floorplan you might do something different.

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Actually, there arent enough outputs on my router to do this. Is there such a thing as a splitter for ethernet cables or do I need to do individual pulls?

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So no, you can't "split" an ethernet cable, but what you'll need is a switch which does effectively "split" a single cable. Your router actually has a switch inside of it, that's how it gives you multiple ports. You will need an additional standalone switch though, and you can get these with 4, 8, 16, 24, 32, or more ports. They also come in "dumb" or managed varieties, as well as PoE (power over ethernet) and not. If all you're doing is running data lines to computers and TVs, then a regular dumb non-PoE switch with a sufficient number of ports will do. All you'd do is plug a cable from one of your router's ports into one of the ports of an 8-port switch, for example. Then you can plug devices into the 7 remaining ports and they'll work as if they're plugged right into the router. You could also daisy-chain another switch into a port on the first switch if you had to. So like I mentioned above, and as I've done in my own home, I have run one cable from my network cabinet to the far end of my house, and there I have another switch from which I have run cables to several other devices. This saved me hundreds of feet of cable vs. doing "home runs" to all of them. The only downside is those multiple devices compete for the same 1gbit of bandwidth back to the main switch over that single cable, but that is nowhere close to being a bottleneck at this point and if it is ever then I'd upgrade to 10gbit switches and keep the same cabling in place. But that's another whole thing.

About the PoE, that would be used for powering security cameras or additional wifi access points. This feature is extremely handy, and I will recommend getting a PoE switch. The cost difference is not that much, and it gives you the flexibility to for example install a ceiling-mounted access point near your office to improve the wifi around there. That alone would probably solve your problem without hard-wiring to each room, but that's not a bad thing to do anyway.

Edit: You don't really *need* a PoE switch in order to use another wifi AP, as you can use a PoE injector to send power to a single device. It's just a PoE switch makes it tidy.