You’ll need to go by cab or shuttle bus from Podgorica airport to the central bus station which is distanced appx 15 minutes by drive. The taxi cost shouldn’t exceed 7-10 Eur, and bus ticket Podgorica-Kotor Can be purchased in advance through busticket4.me . In case you buy it online, be mindful additional 1 Eur cost will be charged on the bus station as service charge. Second option is to but bus ticket directly on the bus station.
Get a driver. They pick you up at the gate and drop you off at your destination. Door to Door service basically. Not that expensive either, plus you will have a fixed price and way better compared to a taxi