Here are some links to resources, in addition to the one on Emma’s reply. The first batch of links goes to work that Karen Myers did a few years ago.
This video has some of the pitfalls of a constructed language (“conlang.”)
If you want a pro, here’s :https://conlang.org/
As you find other sites, please post them in the comments. I will try to monitor the comments, so I can lift posts out of moderation ASAP.
Mad Genius Club 
2 responses to “Language Links”
Thank you so much for pulling these together!
Also, I know it’s wikipedia, but the Swadesh list and similar lists of “concepts most languages have”/”concepts most languages have and don’t seem to borrow words for” seem like they might be useful to conlangs:
https://en.wikipedia.org/wiki/Swadesh_list