How to get access to these end points?/ Can you give me access to one of them? I will be messing around with data a bit and try to integrate it into my bot. I'm not too familiar with RESTful APIs so please include as much details as possible about it

You can find a useful online API testing tool here:
https://reqbin.com/Just send a request to one of the ninjastic.space endpoints (like these examples TryNinja gave) and watch the responses. You can also find code samples for popular programming languages. Try it. RESTful APIs are quite simple and easy to implement.