Outsource it. Add it as a cost of business in your business plan. Until one day your business is large enough it's time to in-house it and begin hiring.
If you're using Google Sheets or Excel for accounting, you're not doing accounting. You might be keeping track of the company's balances and receivables, but it's not accounting.
If you're going the DIY route, make sure you pick an app that is designed for your jurisdiction. An accounting app designed for one jurisdiction might not (and often does not) satisfy the accounting requirements in others.