Just to amplify what Steven has said, and add a couple of things.
A splitter is correct. Get one that does not have spare outlets, as that will cost you a loss of signal. (You can add terminator caps on unused ports. I don't know how well they do.)
Get a good splitter. Cheaper ones will lose signal, and for a few dollars more, why not? Amazon sells them.
You can tell the difference between RG6 and quad shielded RG6 cable. The quad shielded is better, but costs more.
If you will add your own connectors on the cable (thus not buying pre-made cable) then learn how to do so. Avoid nicking the center copper, as this will cost signal. A poor job at this point will cost you signal.
By the way, be careful, as some quad shielded RG6 uses a steel core with copper cladding on the core. Less expensive, but not quite as good.
Whether you need a pre-amp is a question of where you live. We need that amp badly, but we live so far away the signal is sent via airmail. :) If you will add an amp, you will need to climb on the roof, as the amp will strengthen the signal coming from the antenna.
Note: you can do as I have done, and have multiple antennas. In fact, we have a small farm of 4 antennas (soon to be 5), all carefully multiplexed together, sitting inside our garage attic. While this costs some signal, it protects the antennas from weather damage.