I am still amazed by how many companies do not set an annual budget at the beginning of each financial year. Producing a budget starts with the sales forecast and if you are not great with spreadsheets there are plenty of .co.uk sites where you can download a free generic template. Group your main products into categories and decide how many you expect to sell each month, add the sale price and your buy price for each category and the template will calculate your gross margin. Decide how much of that gross margin you are going to spend on Overheads (salaries, travel costs, marketing etc.) and out of the bottom drops your monthly profit.
If your business requires capital expenditure, put this on a separate sheet and decide the period over which you want to write these assets off (depreciation). At this point you should probably give everything to a management accountant who will ask you questions like how long your customers take to pay you and when you have to pay your bills. If you cannot afford a management accountant yet there are management accounts templates on the web that will also turn your assumptions into a profit and loss, cash flow forecast and balance sheet for your business.
