First of all, welcome! Thank you for choosing Noobscraft! I'm sure you'll enjoy it here.
As to your questions, if you get stuck in a hole (unless you're VIP) there's on way to get out. If a mod is online, I'm sure they'd be happy to TP you out.
If you're in the wild and you see a temple or village, you have to claim the land in order to own the temple/village.
If you have any other questions, please do not hesitate to ask any staff member, we're always happy to help!
-gg