When I did my business plan, I set out what I wanted to do (outcall), how much it would take me start up (massage equipment, products, linens, advertising, filing cabinet and file folders, phone line, business cards, copy paper for intake forms, etc). Even priced sheets at Walmart, so I had the correct dollar amount for everything. I included a price for an unfinished wood filing cabinet and the price for a quart of paint to paint it, lol. I researched the price for local newspaper ads, Yellow Pages, etc and decided how/where I would spend my advertising dollars. I tried to think of every single thing I would need to do my business. Professional insurance and association fees, licensing. Laundry detergent. Candles. CDs and a portable CD player. Paper gift certificates. Things you don't think about in the beginning.
Another student opted to 'open her own shop' and made sure she included the cost of decor, plants, rent and utility deposits, office furniture, etcetc.
Then I thought about where I wanted to be and where I would be, 3, 6 and 12 months after graduation. How many clients I hoped to be seeing each week (and I was realistic about how many I would have when starting out) and how many at each milestone of the 3/6/12 months; what I would need at those points such as more linens, more products, how I might be looking at different and better advertising such as buying a bigger ad in the Yellow Pages, or placing weekly ads in the local paper fora few weeks. That I might consider incorporating at 12 months, or hiring a tax preparer who specialized in small business. Also noted that I would be setting aside money for license & insurance renewal, CEU and CPR classes.
Not sure if that's what your instructor is looking for but hope it helps somewhat!