To make sure things go smoothly, here are a few things you need to keep in mind.
Make sure you have all your scuba gear
When you are going to board the dive boat, it is important that you double-check everything. Your scuba gear needs to work fine and just in case something is amiss, ask your instructor for guidance.
It is alright to not know everything and being honest about it is definitely better than getting into trouble after you dive. You can also choose Padi dive center online.
Carry out a buddy check
Get to know your diving buddy as it will make things easier for both of you. It will be safe for you to have someone you know in the deep waters. Before you dive, always do a 'buddy check' which is basically checking each other's gear so that you can rest assured that you two haven't forgotten anything.
Carry the minimum dive gear
Are you planning to carry extra stuff like an underwater camera? You shouldn't do so if this is your first time and you are still at the basic level. You can try carrying more stuff with you when you get the hang of things and get comfortable with diving. For the initial stage, it is better to keep things minimal.
Follow what your instructor says
Keep all your diving experience aside and listen to what the dive guide or instructor has to say. Follow what is said to you including about the route you have to follow and what you need to be careful about.