The Ducati Scrambler Sixty2 can be a great choice for your first motorcycle. It offers a combination of style, manageable power, and a lightweight build, which can be ideal for new riders. As you mentioned that you don't care much about speed and prioritize a light and reliable bike, the Scrambler Sixty2 fits those criteria.
With its 399cc engine, the Sixty2 provides enough power for enjoyable city riding and shorter trips, while still being manageable for beginners. Its lower seat height and lightweight design can also make it easier for riders of your height and weight to handle.
When selecting your first motorcycle, it's important to consider factors such as comfort, maneuverability, and ease of use. You may also want to consider taking a motorcycle safety course to build your riding skills and confidence. Ultimately, it's a good idea to visit a local Ducati dealer, sit on the bike, and potentially take a test ride to see if it feels comfortable and suits your preferences.