open Visual Studio, create a web project or console app, and then right-click on the project and pick "Add Service Reference" from the context menu.
Enter the file path and name into the box and import the WSDL - this will generate a simple, very basic WCF client for you to use. You should find a "YourservicenameClient" class in the generated code which should have methods for each of the defined methods on the WSDL contract.
Instantiate the client and call the methods you want to call - that's all there is!
YourServiceClient client = new YourServiceClient();
if you need to specify the remote URL (not using the one created by default), you can easily do this in the constructor of the proxy client:
YourServiceClient client = new YourServiceClient("configName", "remoteURL");
where "configName" is the name of the endpoint to use (you will use all the settings except the URL), and the "remoteURL" is a string representing the URL to connect to (instead of the one contained in the config).