What i need to connect these things and how?

So i got a phonic am240 compact mixer,a tascam us 200 and i will get the Mpc 1000.
I have the krk 5 connected to the PC.I dont care making mpc going out on a DAW but i want it the music coming off from the krks.How i will attach these things together and what i will need?

You will need common sense to figure out this conundrum that you have gotten yourself into.

Attach your PC to the Tascam US200 using a USB cable. This will get sound from the PC to the soundcard. You should already have this cable.

Attach the Tascam US200 OUTPUTS to a set of inputs on your Phonic AM240. This will get sound from the soundcard to the mixer. For that you will need this cable:



It's called an RCA to 1/4 inch Jack cable.

Attach your KRK monitors to the OUTPUTS of your Phonic AM240. This will get sound from the mixer to the speakers and as a result the sound card and PC. For that you will need 1/4 inch Jack cables that look like this:



Another set of those will connect the outputs of the MPC 1000 to another set of inputs on your Phonic AM240.

So now you have all your sound sources going through the mixer and out of the speakers. As Dave_Mode sort of says though, before dropping a load of cash on gear do a bit of reading/research. Being spoon fed is about 0.01% as rewarding as sorting it out on your own.

Good luck and welcome to the forums.