Thoughts on made up languages?
I recently have been toying with the thought of making my own language, just for fun but also with it having some sort of structure that makes sense. Do people think that this is a good idea, if the language is not going to be well known?
Depends on what you mean by a "good idea". Conlanging is a hobby for loads of people, and a lot of people (including myself) do it purely for fun/entertainment - so in that sense, it's definitely a "good idea" because it's fun! Some people also use conlanging as a tool to learn more about linguistics and grammar in general, so it can be educational, too. But if you're planning on trying to make a language that other people will learn or be interested in... eh, good luck.
If you're looking for a starting point, I'd recommend checking out the guide here: www.zompist.com/kit.html . You might also want to start lurking around on the Reddit page /r/conlangs or take a look at the website conworkshop.com
They're fun to make I suppose but not something I'd ever take the time to learn - not even Esperanto. Personally I prefer to language real languages for the real world and like to connect with cultures with plenty of history behind them. However, I'm not criticising anyone who does like conlangs :D They're just personally not for me.
If you and your friends can speak it between yourselves then maybe it's a good idea but (in my opinion) it's much better to learn real languages that you'll get to use.