[QUOTE=BKR;2882555]1.) Welcome to Judo…
2.) Regarding falling (ukemi): If you are falling like that, it means you are scared. Probably because landing hurts given your physical ailments. You are trying to protect yourself, and end up injuring/hurting yourself (shoulder). Sounds like you may need to slow down and work on getting used to falling, learning the correct position to land in, etc. Hopefully your instructor can help you with that. He/she should have already noticed your issues and be taking corrective action, if not, you should ask for help.
a.) work on being “thrown” from your knees or one knee rather than standing.
b.) work on your ukemi alone, drilling landing positions from low positions until you feel more comfortable.
c.) If you are doing randori, back off. lack of falling skills or physical issues with falling require you to be more patient and take it slowly.
3.) Ashi Waza: De Ashi Barai is one of the easiest falls in Judo, and I would think you could do it without hurting yourself.
a.) Try De Ashi Barai with uke and yourself moving sideways, both of you with one foot forward, if you are in right hand stance, more to your right and sweep uke right foot with your left foot, or, you as tori can stand in shizenhontai (square stance). This This can start out as a ukemi drill more than throwing practice.
Your instructor should be able to design a program for you to work around your physical issues. Be aware though that Judo, even when done well, is often not the most comfortable thing in the world.[/QUOTE]
Better advice than what I said.
For sure, learn to walk (fall correctly)
Before trying to run (worry about throwing people).
And all the best principles of both Judo and Jiu-Jitsu are found in De Ashi Barai.