Hello Caroline Davies - The series suggested by Debbie Coldiron are an excellent way to start. Here's two more suggestions for after you are done exploring those.
Andrew Sealy's Metabolism Boosting Yoga Short 20-30 min videos. It's a good overall flow.
https://grokker.com/yoga/vinyasa/program/metabolism-boosting-yoga-with-andrew-sealy/5616aadcb2c2ebce099b46e9
Sonia Doubell's Yoga for Tension Relief - They are short 15 min videos. These are more of stretches rather than a full vinyasa flow. But great on days you are running short on time.
https://grokker.com/yoga/gentle/program/yoga-for-tension-relief/5568afe3262bc74e29a49cc0
Hi Caroline Davies. Welcome to Grokker! We have a lot of wonderful beginner yoga videos. I've attached 3 from dfifferent instructors that you may enjoy. In addition, we have a lot of beginner yoga programs that offer you a schedule of videos that takes the guesswork out of choosing which one and when you should do a video. You may want to take a look at these programs:
https://grokker.com/yoga/beginners/program/yoga-for-beginners-with-siri-peterson-cavanna/56c4cb8555ebe0d0080df682
https://grokker.com/yoga/vinyasa/program/3-steps-to-yoga-with-celest-pereira/57dbf7e596a02c934191d55c
https://grokker.com/yoga/program/yoga-basics-the-beginner-s-guide-with-celest/57dbf89c96a02c934191d5a6
https://grokker.com/yoga/beginners/program/beginner-s-guide-to-yoga-with-michael-james-wong/5727bea7ae15771574119c49
Hope this helps!