How should you start personalization in AEM?
How many audiences do you need on day one? Fewer than you think. Personalization in Adobe Experience Manager usually runs through targeted content, often Experience Fragments shared with Adobe Target. Each audience you add is one more variation to write, review, and keep current.
A good first version uses three or four segments built on data you already trust. Think signed in status, region, or the product line a visitor viewed. Each segment gets its own hero or offer area. The rest of the page stays shared, so caching stays simple.
Is a variation actually working? Measure before you add more. Adobe Analytics consulting services can show whether a variation changes behavior or just adds content to maintain. If a segment shows no difference after a fair test, retire it.
The hidden cost is content debt. Variations outlive the campaigns they were built for. Months later nobody knows which ones still matter. Give each one an owner and an end date when it's created.