Pawanmuktasana Series 1,2 & 3.
It means wind-releasing because these movemetns because they are not really asanas ,per se, help towards freeeing up energetic obstructions mainly in the hips and legs etc.
Ideally Find a teacher who can go through them with you because there would be a bit of alearning curve over time if you tried to learn just with instructional aids like I did…You will find it outlined in the very start of the BSY Publication titled ‘Asana,Mudra,Bandha,Pranayama’ I think it’s called.There are now even u-tube videos that could also compliment a teaacher too and that boook i mention…Phone up teachers and just ask them if they are familar with this movement Series and possibly request a one-to one if you are able to afford it.
Mukunda who is associated in some way with one of the sub-forums here offers an almost identical thing/series he calls ‘joint-loosening series’ I think in his ‘Structural Yoga Therapy’ book I think it’s called.
These movements should assist you towards developing a solid rock or seat for meditation.Don’t worry about trying to get into lotus or risk damaging your knees through trying to get into a perfect seated pose. That is not the point.The main thing is you are comfortable and can relax so you can concentrate/focus and/or just let go as a prelude for meditation proper.Steady & comfortable seat.
This is a killer or effective movement series for helping open up stiff legs and hips and even shoulders,neck,arms etc get help too.IThey are not strictly or technically speaking asanas.All an asana is a steady seat that facilitates or helps makes meditation easier because the body is comfrortable and we can forget about it more etc.It might seem like you’re working with muscles but deeper down you are actually working with neurology and energies.
Practices done over time with with greater consistency yeild greatest results.Remember to listen to what your body or subtle bodies are telling you.If you do do a few surya namskara or sunsaluations that can end up stoking pingala too much leaving one feeling more irritable than relaxed than before ,then be sure to fit in or finish with savasana/corpse/relaxation pose ( a must or more or less essential at the end of any asana practice) before assuming any kind of seat for sitting meditation.
As long as your are comfrortable ,that is all that matters;You can even meditatie in a chair or, i daresay it ,standing up or walking but for your purposes sitting cross-legged and trying to still or let-go the body/mind is quite satisfactory and great if you can do it.
The asanas you mention sound fine but I would avoid lotus unless you can get into already and this should be fairly obvious. By all meanns try it but never force. Forcing is bad in asana or any yoga. Take relaxed patient attitude.