See How to test TEAL smart contract? - #2 by fabrice for some pointers.
In addition, I would highly recommend to first understand how Algorand works.
You can start there: Getting Started on Algorand | Algorand Developer Portal
or if you want a more hands-on tutorial: GitHub - algorandfoundation/buildweb3: Repository for the Algorand class of the "Building with Blockchain for Web 3.0" course (https://buildweb3.org)
Then I would recommend to read the documentation Smart Contract Overview - Algorand Developer Portal
If you are more hands-on, you may also look for a tutorial that does something you are interested in on developer.algorand.org