I would advice you to buy some good direct drive turntables if you are serious about scratching. Cheap turntables suck for scratching, because you need a strong motor.
Heres some tips:
http://djlab.net/2017/04/11/scratch-dj-turntable-setup/Scratching on a PT01 is really fun, but it's harder. You could start with a PT01, and save money for some "real" turntables later if you enjoy it.
The sound quality from the PT01 is not that great, but you can scratch with it if you get a portable fader, like the raiden fader or stokyo kutter.
http://djlab.net/2017/03/21/portablism-gear-guide/ If you want better sound you can modify the tonearm and put a Shure m44-7 needle on it and you have a dirt cheap scratch setup.
A cool thing about portable turntables is that you can modify them in a number of ways, add buttons, features, pimp the faceplate etc
https://portablist.com/category/diy-mods/If you decide to buy used TTs this guide from Vekked has a lot of good info:
http://djtechtools.com/2016/02/15/2016- ... -champion/If you really want to be good at scratching, get a pair of used Numark TTXs/TT500s and a DJTech DIF-2S mixer. The numark TTs are cheap, but the motor is great. The DJtech mixer is really basic, but the fader is great, so its a pretty cheap but solid beginner setup. If you just want to record scratches for your beats, then a portable turntable will probably work too, but it has limitations.