Tutorial: Apollo 15
From Kerbal Space Program Wiki
Apollo 15 sent people to the moon and a moon buggy, you can design your own moon buggy but I would rather base mine off the real deal. You can use the rocket and spacecraft from the Apollo 11 tutorial as your Mun craft.
Moon Buggy
The moon buggy traveled 5.75 miles per hour the first mission.
Design
In KSP, to strap a rover onto a lander, you will have to attach it radially to the lander on the side, and put a balancing weight on the other side to prevent the lander from tipping over due to an unbalanced center of mass.