But seriously...
Register to do it online its much simpler , keep records and receipts for each clean, when you get paid and BUSINESS expenses then online its as simple as income less expenses less personal allowance equals taxable income and hmrc website works out tax and ni payable. If an expenses is totally business related deduct all of it if not deduct the business portion. Your income is what youve cleaned not what you get paid if you clean but dont get paid its a bad debt which you deduct from income. Any capital purchases for the business ie van, pole, backpack etc can either be offset against income entirely in the first year of trading or if bought after that depreciated as an expense, if your just starting i wouldnt go for an accountant, use a local book keeper if you cant get your head round it. But beware the taxman can ask to see your records upto 6 years after the tax year you filed them and the responsibility is yours not the accountant. Also i wouldnt go limited until you hit a higher tax bracket the accounting is more complicated and you wont benefit. Maybe get in touch with your bank who may help you or search on web but i would avoid hmrc site its confusing i was a part qualified accountant for 6 years and it confuses me! In my experience the taxman is quite understanding provided your records are complete and he doesnt suspect fraud and hmrc are helpful IF you can get through.