Identify your goals and your budget, what is most important to you and your plants versus what are you willing and able to sacrifice? Make a business plan that discusses where you'll get your money, and where you'll use it. Analyze the local market and your competition, where will you fit in alongside them?
Crunch some numbers! How much starting capital do you have? What are your expected operating costs? This can show you where you need to cut expenses, or where you can afford to splurge.
