Philodendron mexicanum is a climbing philodendron that does best in well draining soil and bright indirect light (but it can handle low light too). It is a fast growing Philodendron, and as it grows its leaves elongate and develop lobes.
The plants you see pictured here in the second and third photos are representations of the plant you will receive. The plant in the first photo is slightly larger, and will give you an indication of the leaf shape you can expect to see in a few months time.