@hundertsieben It's great you are being invited. Given current conditions you'll need to forgive them if they quiz you at first - they need to be safe so they need to strictly vet people.
Once you are accepted, just relax. Ask someone to help you - they will - just explain you need help where to go, what to do, they will help you.
Main thing is to relax and just participate to the extent you can. There will be kiddush after - you'll be invited for that. Aim to find 1 person to help you.