A couple things that helped me:
- Make sure it's a Universal Analytics in GA not GA4 which sucks btw
- Connect GSC to GA
- Enable Demographics and Interest Reporting under Admin Property settings
- Enable Remarketing under Audiences
- Search Google Analytics Dashboard Templates and import some for SEO into your Account
- Set up Google Tag Manager for your site so you can build Events that are meaningful and make sure you implement GA Universal Analytics page view tag first then you do the GA Events
- Use Event setting in GA Goals for conversion tracking and optimization (if you plan to run any paid search)
- Link your domain to Ahrefs free account for additional backlink monitoring
Once you have some data on hand (30 days at least), you can start to find some opportunities increase rankings for high volume/value KWs. From there, looking for keywords competitors rank for is worthwhile. That should be a decent start.