Need 1 song mixed & mastering

Hi, I'm independent Singer Songwriter from South Korea, name is Erica Hong. now i'm preparing for my 1st song. the Genre is Electronic pop with trap sound and looking to hire mixing and mastering engineer. i'm not familiar with Mixing processing so have a few questions. Should I remove or minimize effects from beat tracks and synth tracks for mixing. and need WAV.files for all tracks ? and Is there any consideration When i send you tracks for mixing. also wanna know total cost of mixing&mastering&vocal tuning. Await your reply