To view the visits you must service, head to visits list in the left menu and user the filters to get to your route.
Click on the visit you want to service to see the visit details. Before you head to the visit itself, you can check the observations (if there are some, an orange symbol will blink next to the observations text).
If you want, you can click on the address (in the customer details) to open your maps default app and get GPS navigation to your customer. Once at your customer, you can check the job details and the observation details (any number looking like a telephone number will be converted into a call-to-dial link).
Now you can finally start servicing your visit! Head to Job Details and Servicing.