Native Instruments Maschine Mk3 DJ Controller

Q: do got to have a intel i5 i all have amd

It means an equivalent to the power of an i5, so if you're using an AMD as long as it's a Ryzen 5, 7, or 9 and not a Ryzen 3 you should be golden.

Q: Can i use this without the native instrument piano? also does it work with fl studio?

Yes you can use it without other NI instruments. It has its own DAW called Machine and workflow. Also you can use it as a plugin in fl studio. It can also be used as a midi controller. Personally I think it's a bit complex if you use it as a plugin in other DAWs as it takes time to route the signal from its own track into your inputs.