1. Address in Thailand. I gave them a copy of my lease and put my personal telephone.
2. I would use your sole proprietorship info (I did). I also gave them a copy of my AoI (business registration). I also included a cover letter introducing myself and my company. Make sure you include something to the effect of - my clients understand work will be conducted remotely from Thailand.
You can keep your passport as is. When you do renew you can go to Immigration to have everything transferred to your new passport. I paid an agent 2000b to do it for me.
Just remember that you can’t travel if you have less than 6 mths remaining on your Passport.