Waffle Stacking is a TD opener (an opener that uses a T-Spin Triple into a T-Spin Double, also known as a C-Spin).

First Bag

The first bag is similar to most TD openers.

Second Bag

8L perfect clear

If you manage to hold both T pieces then you can send more lines. You may have to take the Triple early.

Switchback

If you can't build the main c-spin build, you can try this build.

Credit to seacucumber for alternate build.

Third Bag into Midgame

You can transition into midgame with a build like this