Great to hear your Sungold cherry tomatoes are thriving! It sounds like you're doing a fantastic job, especially for a newcomer to growing tomatoes. Training them to have two main stems can be a great way to increase your yield while keeping the plants manageable, so you’re definitely on the right track!
As for the first flowers, some growers do choose to pinch them off to encourage stronger growth in the plant, but it’s also perfectly fine to let them set fruit early if you’re feeling optimistic. It sounds like you’re learning what works best for your setup, which is what gardening is all about!
I’d love to see how your plants progress, and if you have any questions as you go, feel free to ask! Good luck with the rest of your tomato growing adventure!