Here is the link for my you tube playlist, Yoga Stretches for Lower Back and Core Strengthening
These exercises are a good place to start, and although relatively simple, you should definitely feel your core muscles working hard! I would try to do 1-2 of these shorter videos 1-2 times per day 4-5 days per week and you can build your routine from there. Incorporate both stretching and strengthening exercises into your daily routine. Please let me know if you have any questions, and I can help you with your technique at your next appointment if needed!
Happy stretching and strengthening :)
P.S. Ekhart Yoga is a great online yoga studio, which is where the videos on my playlist are from. Ekhart Ypga is only $12.50 per month for unlimited videos with hundreds of videos with different types, lengths, difficulty levels and teachers. I still recommend taking a few beginners classes with a live teacher if you are brand new to yoga.