I think you will have a unique advantage with your background in branding as I'm sure your marketing materials will be top notch and eye catching.
Are you maintaining any lawns currently? If not I would highly suggest getting a few customers under your belt so you know what to expect once you get into the business full-time in 2014.
What plans to you have to obtain a customers and actually be "full-time" in this industry in 2014? That is a very ambitious goal if you have no customers now, but would definitely be very attainable if you are already working in the industry part-time.
I love your designs though!!
'07 Chevy 2500HD
2010 John Deere Z925A 54" MOD
2011 John Deere Quik Trak 647A
John Deere walkbehind