A two board is more beneficial to you than a 3 or 1 board. You can use a 2 during ME upper body workouts and get more benefit as a raw lifter.
I use a westside template and train without gear and have used three boards, but I like them better for lockout work after DE work rather than a ME exercise.
You can really get boards for cheap. I just have a bunch and tape whatever number I want together with duct tape. Chains and bands are great tools, but they aren't a must for someone who hasn't lifted this way before.
If I were you, I would do WSSB, or at least read through it, as it is a great program to introduce a lifter to the Westside style.