I agree with the earlier post....you have to find something you really like to do and am passionate about. I have been in sales for 35 years, mostly owning my own businesses (which means you have to know how to sell) and I have owned 5 different businesses over the years. After a degree in marketing, I took a Dale Carnegie sales course that taught me more in 16 weeks than 4 years of college....and today they really focus on Relationship Selling. Read Mahan Khalsa's "Lets Get Real or Let's Not Play".
The other advice I would give is, find something that pays residual dividends, whether it is real estate, insurance (which is not recommended today) or products that you can sell to the same clients over and over. I have a buddy that has been in the light bulb business in Las Vegas for 20 years. And many of his early customers are still with him.... he knocks down about $260K in commissions, and 75% is from repeat clients.
Should you decide to go into the landscape (since you have a start) business as a career....go commercial landscape and maintenance. The repetitive busines is there and large accounts are ongoing. Another buddy of mine is doing over 5 Mil a year in Commercial landscaping after 6 years....and making a nice living... it may not be the sexiest business there is...but his new Porsche is :)
Good Luck and good selling!!!
Steve Davidson (doing what he loves)!