When you approach a roundabout and plan to take the first exit, you should:

• Position your vehicle in the left lane (especially in multi-lane roundabouts if lane markings guide you).
• Signal left as you approach and continue signaling left while driving through the roundabout.
• Give way to traffic already in the roundabout coming from your right.
• Exit at the first exit while keeping the left indicator on.
• Turn off your indicator once you have left the roundabout.

This approach helps indicate your intentions clearly to other road users and aligns with common road rules in places such as the UK, Australia, and other countries following similar traffic norms.