As CJ_London as pointed out, your worst mistake would be to dive into this without understanding db normalization. See post 15 here for a set of links to subjects that will help eliminate a lot of mistakes that novices make. One other thing: the goal a common one so you might be able to find a template that you can modify. However, many of those contain design elements that are commonly thought to be poor design, so if you grab a template and dive in and don't review any of the links provided first then you're not doing yourself any favours.
BTW, predictive and corrective maintenance and equipment reliability was my career for a time.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.