to interact with and activate items its either by holding alt then pressing the e button or double tapping e (it depends on the item)

to bind certain commands you do the usual (bind (any button of your choice)) then type the command you wish the button to execute, EXAMPLE (bind p jmod_ez_inv )

to craft things you simply need a workbench and the resources need to craft your item of your choice

i might add more to this later comment any questions you have.