Hey man, glad you joined!
jut delegated you some Hive Power so you shouldn't have issues with running out of Mana so fast. The point of it is to prevent ppl from creating tons of of bot accounts to farm likes, and it also makes you choose what you like more carefully.
Seems the introduction post link is broken, but basically it says that if you use the tag "introduceyourself", that's where people go to look for new members to follow. They also suggest you take a picture of you holding a sign saying you joined Hive, to prevent plagiarism. Often people will pretend to be someone, then steal all their music or pictures off other platforms, and then try to profit off them.
Also find communities for any hobbies you post about. it's a great way to get noticed, and start getting paid good for posting. Keep it mind there are tons of ppl just expecting handouts, so the key to stand out is to engage with people, and actually network with others. Very quickly you'll find yourself getting all kinds of big likes, or advice on how to do better.