I have been mobile for 3 years and love it! I book an hour for all cuts, blow dry's, hour and a half for sets and 3 hours for colouring and work within a 10 mile radius. I have a sat nav which I couldn't be without now, rarely get lost! And I let it go to voicemail when driving and then phone back at lunch or when I finish in the evenings.
As for advertising, I got all my clients through leaflet drops. I did the 4 main villages local to me, then the rest was word of mouth. It does take time, but once you have a few regular clients it soon picks up. Don't get disheartened at all, it just takes time.