Here are som threads you may want to look at. This subject has been discussed so much that I'm positice you cab find all the answers you need.
https://community.auctiva.com/eve/forums/a/frm/f/5371029503
https://community.auctiva.com/eve/forums/a/tpc/f/579609941/m/2111000313
https://community.auctiva.com/eve/forums/a/tpc/f/5371029...731032113#3731032113
Also click on this link to add yourself to the list of sites that will have a store on Auctiva Commerce https://community.auctiva.com/eve/forums/a/tpc/f/5371029503/m/4231013213