I don’t know if I’d go straight into single leg on a wobble board unless you’ve got a good background of strength training. I’d be inclined to start with two-legged squats and single leg/full deadlifts before progressing to single leg squats.
Obviously dependent on your experience - I find the one leg squats hard on the knees and have to build up to them.
That said I don’t have a huge background in weightlifting, I started about 5 years ago following another injury and usually just adapt a programme that was developed by a physio for me. I know what works for me, but don’t really have the background to give you sound advice.
It might be worth posting on the forum below. There are plenty of members with piles of experience that might chip in.