If I were you, the very first thing I'd do is build a simple spreadsheet to model my cash flow. The guys at EcomCrew, Lance and Ricky, constantly repeat that cash is king, and I’ve learned they're right. Your inventory is really just cash sitting on a shelf, and you can't make smart decisions about it without first understanding how money moves through your business.
In week one, I'd focus entirely on this. Use your spreadsheet to track your cost of goods, your landed costs (including freight and duties), and your average daily sales for each SKU. This gives you a baseline for your sales velocity and, more importantly, your cash conversion cycle, which is how long it takes for a dollar invested in inventory to come back to you as revenue. It's not glamorous, but it’s the foundation for everything.
In month one, I’d use that data to get into basic demand forecasting. I’d be looking at my supplier lead times and my sales velocity to set rough reorder points. The goal is to answer the question: “When do I need to order this product so it arrives the day before I sell out?” Chelsea Cohen talks about this on the Amazon Legends Podcast, stressing how crucial this is for avoiding stock-outs, which can kill your sales momentum. Andrew Faris on Ecommerce Playbook even shared a painful story about how his brand unexpectedly ran out of inventory, and it’s a situation you want to avoid at all costs.
What I'd ignore at the start is the lure of complex, expensive software. On the DTC Podcast, Pauline Shiu made the great point that a big ERP system isn't always the right answer, especially early on. You can do so much with just a spreadsheet. Master the fundamentals of your own business first. Once your spreadsheet becomes truly unwieldy, that’s when you start shopping for a tool because you’ll know exactly what problems you need it to solve.
The single biggest trap I'd want you to avoid is making a huge, reactive inventory purchase after a sudden sales spike. It’s so tempting to see a product take off and want to order six months' worth of stock. But that spike could be a temporary fad, and you could be left with a mountain of dead stock tying up all your cash. Smart inventory management is about making calm, data-driven decisions, not emotional ones.