There are many ways you can set up a Labyrinth. If you are brave, have some geometrically inclined friends, and the resources you can make one yourself. There is an example below or you can google another style you like.
If you want to set it up outside you can mow one into some over grown grass, rake one into some fallen leaves or outline a path using stones or brick. I have even seen ones that incorporate herb and vegetable gardens into the dividers. This can be as permanent or temporary as you desire. 
If you want to set one up inside I might suggest painting one onto a canvas or if your building committee is adventurous, directly onto the floor!
Lastly, you can buy labyrinths in many styles and sizes online.
Often when a labyrinth is built out doors on Church properties or in parks, and left open to the public to use, the creators will post signs like the following:
“Be open as you begin. Notice what comes. Welcome God. Use all that happens, including distractions, as mirrors of your life. Follow where you are led, even if you end up moving “off the path”. Tread, leap, stop, dance, pause, and continue on. Move with the rhythm that suits the moment; it may ebb and flow. Enjoy the center, why hurry away. Let Christ know your heart and mind. Welcome Holy Spirits’ input.”
“Before entering, let go of any expectations. Gather yourself before stepping over the threshold. Some find it meaningful to cross themselves or bow. After traversing the threshold follow the pathway toward the center. When in the center, take as much time as you want there. Stand, sit, kneel, or lie down if you like. When ready, follow the pathway back out. Be conscious of crossing the threshold between the labyrinth and whatever lies beyond. Before leaving, take a moment to express gratitude. Many find it important to then journal, sit silently, draw or sing afterwards. The labyrinth is a safe place. If for any reason you do not want to continue, you can leave the pattern at any time.”
Or this one on an indoor Labyrinth….
“Welcome to the Labyrinth: Your here! This is well, you have been seeking. Put down your baggage anywhere; it will be attended to. That distinctive scent is from a burning candle, love lit it, in anticipation for your arrival. Beauty will help you get oriented. She usually suggests, “leave your shoes by the front door.” Please, make yourself at home.”
