We're trying to build the content and category structure for our newly launched industrial packaging and packing materials e-commerce site based in Cologne. Since we're in the early stages, we really don't want to shell out 120-150 EUR a month for professional SEO tools right now. We haven't turned on our ad budget yet either, so the search engines' own ad planners only give us broad, useless ranges like '1K - 10K' instead of actual search volumes.
Our goal for the first 3 months is to produce product and guide content that attracts the right B2B customers to our site. But most of the free methods recommended online are either way too superficial or just pure guesswork.
Is it actually possible to gather reliable, actionable keyword data in the first 3 months without subscribing to any paid tools? Which free sources should we use, and in what order?