Having done this professionally, I agree with Tim. Database design and development is a lot of work, and data entry is way more than that. It’s a hobby in itself, if that’s how you like to spend your time.
I have no system of record at all. I organize my collection into boxes, grouped by subject, and label all the boxes. Built and unbuilt toys are kept under the same system. Boxes are stacked on shelves with their labels visible. As the inventory grows, I have to add boxes. Sometimes I reorganize and relabel. That’s some work, but it’s worth it.
I can pretty much find whatever I want with a little rummaging. Every so often I look around the storage room, feast my eyes, pop a few boxes and refresh my memory of what I have. Sort of like Smaug the dragon, lying on his treasure hoard…
You'll shoot your eye out, kid!