No, not at the beginning.
Nevertheless, you should keep proper records of your income and expenses for when the time comes to file your tax returns. MyShowcase will keep a record, for you, of your income and expenses form purchasing products and marketing material.
There is no prescribed form for keeping records and preparing accounts - some may keep all the bills in a folder or shoebox while others will use Excel or some accounting software. What matters is that you have the receipt for any expenses that you want to claim when filing your tax return.