You have a sponsor and hopefully he or she is guiding you. You can basically copy that guidance and do the same with your PSA's
If something comes up that your sponsor did not help you with you can ask him or her for help. If they can't help you you can ask your co-sponsor.
You can also ask the question in the forum or somebody might've already asked it and then you can read all the answers there.
You also have Ask Gery available to you if you get stuck and do yourself a favor - take a tour of the sitemap. You will learn so much there that you will have all the confidence in the world to be a great supporter.
Go back to your Launchpad lessons - you will find a lot of answers there. SFI is great because it gives you all the tools you need for free and you learn as you go. If you put in the effort and the time you will soon know a lot more than now. Don't doubt yourself - you will find a way to help and guide your PSA's while you learn too.