lowering and spacers help Please and thanks

Naum Muvceski

I know this may have been answered already but i am intrested in purchasing Eibach lowering springs and a set of wheel spacers 20mm-front and 15mm in the back. I have done a little bit of research but not enough. how far would i be lowering it am i gonna have to adjust anything or what not. And would i be rubbing anywhere with that set up. Im not looking to do a expensive coil over upgrade but just a durably resonable upgrade. Is there anything i need to know, i can us some help from any exprienced individual. I really appriacte any responsises and helpful hints. Thanks guys