You have to be fit to train with Caroline Girvan. She does have an Epic Beginners programme, but even this is pretty tough. What weight dumbbells have you been using up until now, @superplumb ? I started out with 3 kg and worked my way up - 5, 8, 10, 12 kg. I still use all but the 3 kg, depending on the moves, but always try to challenge myself.
If Caroline's Epic Beginners looks too tough for you, check out her shorter workouts that address abs, shoulders, glutes etc. She has loads of those too. In my view she is the best online trainer out there and her workouts are very professional.
Also look at Growingannanas HIIT, with and without weights. She too has a huge back catalogue of excellent workouts, so you never need to do the same workouts twice - though they mostly follow a similar format.
To get into shape generally I'd recommend the following, which I still do regularly:
Lucy Wyndham Read's Thighs & Glutes and some of her other leg and floor based workouts, such as those aimed at pear shaped women and her muffin top workouts.
Rebecca Louise's Best Abs, as well as Bingo Wings, Ageless Arms and Best Arms.
The Bowflex 3-minute plank, which I do virtually every day.