Start by painting your entire sign with the white paint. Use a dry brush technique to leave the surface a bit rustic with unpainted areas. You can also just paint as usual if you don't want the more rustic appearance. A dry brush technique involves getting as little paint as possible on your brush then rubbing it quickly over the surface. Once you have completed painting, allow your project to dry completely before continuing.
In the meantime, you can print your templates onto copy paper and cut out. Use tape to secure to the sign once it is dry.
Add transfer paper with the shiny side down under your template. Use a pen to trace around the entire template then lift from the surface. You will be left with a guide for painting your lines.
Then use a small paint brush and the black paint to fill in all of the areas.
Want a more rustic look? Once the paint is just barely dry, use a damp rag to rub away areas of paint.
You can remove as much or as little as you like to give you that farmhouse feel to your pumpkin patch sign.
You could also try sanding the surface to get that rustic look but I really like the damp rag method. It gives me just the right amount of rustic with very little elbow grease.
Allow your entire pumpkin patch sign to dry completely before adding to your home. Mine ended up on my mantel and I must say that I love the results.