Plan to work all the time.
Plan to lose money for a considerable period of time. Vette your business model and your pro-forma with CPA and any business exec you can get to listen. If you don't have a business model, plan, and pro-forma (with best and worst case projections) then you are not ready to start a business. Plan enough $ to cover your personal expenses (and your partner?s) while covering business losses for a considerable period of time. Nothing like adding to the stress of a new business with the fear that you are going to lose your house.
Form a corporation. Look at the stats on partnerships. Most fail and take the friendship with them. Have a structured plan for dissolution, principal invalidity (what happens if you or your partner get cancer or hit by a car), principal bankruptcy, principal bad acts.
Plan to work ALL the time.
Plan to work ALL the time.
Know what your goals are: Sell the business, Put Management in place and withdraw, work like a dog forever. Make sure your partner's goals are the same.
Funding companies want collateral (especially now - much tighter than it used to be). They know the stats on small business startups (do you?) - 75% fail within five years. They want something they can sieze if you don't pay the loan.
Keep religious sales tax records. You will be audited for sales tax at some point - it is a guarantee.
Make sure you account for your actual expenses: rent, real estat insurance, electricity, workers compensation insurance, liability insurance, federal unemployment, state unemployment, federal income tax, state income tax, state franchise taxes, self-employment taxes, utilities, equipment, uncollected revenue (bad debt), advertising expenses, training expenses, employee turnover.....
Be aware that your boss may be a jerk and require you to work all the time.... Mine does.
Employee will be a hassle. 10% of your customers will be a hassle (90% will be rational reasonable people - don't let the 10% corrupt you).