So for booster pick the packs (and price) you want to use. Every person gets the same packs, so if you choose to do all the box sets (EC-PoC) everyone gets one of each. You start with the oldest pack, which is EC in this example, everyone opens it at the same time, you take one card and pass to the right. Continuing taking one from each pack passed to you until there are no more cards. Once you are done with EC, go to PC and do the same as above BUT pass to the left this time. Continue through the packs alternating right and left until all cards and packs are gone. Then you will proceed to build a deck. 7 non-special ability lost souls should be available for everyone as you don't normally have enough lost souls to build a legal deck without needing extras.