I use either primos or wayne carlton mouth calls and a tube. An old vacuum tube is all you need or spend the money on a camo wrapped one.
Takes practice but you will get it no problem. The wayne carlton I really like the double reed and can get some deeper bugles. The primos has a different feel and a plate in it to keep shape. Little higher pitched which is good to sound like a younger less dominate bull.
Both are easy to cow call with. Practice that first


Go to walmart and most of them have a primos 3 pack on sale with a cd to listen to for under $15.
Most of those calls are $5 or under.