Want to Accept bitcoins from php form
Block.io is pretty easy to use, but their free api is limited.

Blocktrail is another option that is easy to sign up for, and relatively easy to use as well.

My personal favorite is still blockchain.info but you are not the first one to mention difficulties getting an API key. 

I've noticed the same lack of tutorials for Bitcoin web development which is why I started my site and youtube channel 2 years ago. If you Google how to use block.it api or how to use blockchain.info api you should be able to find tutorials that will help you.