first time traveling abroad with a group of 10 — what should we prepare?

we’re planning to travel abroad next year, and we’re thinking of going to vietnam. we’re a group of 10 friends traveling together.

only 1 person in our group have traveled abroad before, and even that was quite a long time ago. the rest of us are first-time international travelers, so we’re already getting nervous just thinking about immigration.

we’re literally still in the planning stage, but the overthinking has already started hahaha. like, what if one of us gets offloaded at immigration?

for those who have traveled abroad from the ph, especially first-time travelers, what should we prepare beforehand?
should we have things like:

- bank statements / proof of savings?
- certificate of employment?
- any other documents that might be useful?

also, since we’re a group of 10 friends, is there anything we should do differently when going through immigration?

we just want to be prepared and avoid unnecessary problems. any tips, advice, or things you wish you knew before your first international trip would be greatly appreciated!

thank youuu!