Hey, I am wondering how to create blocks that are sorta like vertical slabs but thinner (similar to forge microblocks 'covers'). I am looking for any tutorials that can replicate this effect or for me to learn and place them how I want, learn to texture them right etc. Thanks.

Why not start by looking at slabs? Specifically, look at the model .json and Block class files.

 

In the model .json, you will have the block's rendering bounds described, as well as the rotations for different states (such as facing north-south or east-west).

 

Then in your Block class, you will need to make sure that the block's physical bounds match based on its current state, etc.

 

I recommend you Google a basic 1.8 block tutorial and make some basic blocks first, then practice making blocks with different sizes, such as a small cube. Just play with the values in the .json and Block class, fire up your IDE's test environment, and see how it looks in game. Then quit, change the values, see how it looks again, rinse and repeat. That is how modding generally works.