5.2 help

Hello everyone. I need a little help or advice. I do epic 5.2.
1. For quests to work, you need to select QuestLink from the RDB Tool from which epic?
2. How to connect an online shop so that things from it go to the store automatically? Is there a sample script?
3. How to create a personal account? if it's not difficult, write an example of your personal account

I think you better find someone who can explain and tell you everything, it will be much better for you
because you have a lot of questions and I think you are still a beginner and they will dont help you with every question