There are multiple ways. One way is to select a graphic that is set up how you like, Control + Click on it and choose Add to Favorites. Now that object style will show up in your style well.
Another way is to Copy Object Style, select everything you want to have those magnets and Paste Object Style.
The last way is to set up a stencil and drag in shapes into your document from the stencil browser that are all set up how you want them.
Yet another way, is to click the shape tool, and before you change anything else or draw a shape, set up what you’d like. That will change the shape tool default style.
Hopefully one of these workflows will be the best solution for you!