Real talk would I be able to put together a decent build for $700
ya
For 700 u could do a Ryzen 5 3600, a good B450 board (may need an update kit from AMD), 16gb DDR4, an SSD / HDD, good case / psu, and a used 1070 for roughly 200usd (check eBay or /r/hardwareswap)
idk jack stuff about computers but how much do you think a decent laptop should be priced at that can at least run games like team fortress 2?
Ryzen 5 /7 APU laptops are real cheap and can run TF2 great as forget and other lighter games or AAA games if u lower settings