OP you can do nothing for the LORD. All He wants is your love and faithfulness. OP in order to be saved you must beleive in your heart and confess with your mouth that Jesus died on the cross for your sins. You must than repent of all of your sins and ask God to forgive you. Romans 10:9 and 10. After you are saved repent daily and ask God to forgive you of all your sins that you commited that day. You are already saved but you are asking for forgiveness of your sins that you have committed that day. You don't have to worry about naming them. Just be truthful with the Lord and talk to him. There is nothing to be afraid of. Jesus Christ loves you.

Romans 10:9 That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved. 10: For with the heart man beleiveth unto righteousness; and with the mouth confession is made unto salvation.

OP you than need to find you a Christian and be baptized if you are able to. If you are in such bad health don't worry about it. God understands. Good luck to you OP and I will be praying for you. Remember once you confess your sins with your mouth they are no more.