I have attached
I have attached my previous mark sheets and transcripts with my ECA. You need to play safe and provide them as much information as possible. Providing additional information will not lose anything but not providing enough information can prove to be risky and expensive in future.
For your second question, I think you need to select 'Two or more Diploma or Degree'. But make sure you have ECA for your diploma and degree both. ECA is needed for your all education which you are showing in your profile.
For your third question, In future, if you are planning to add your wife in your application, you need to submit marriage certificate. IRCC or OINP are smart enough to match the marriage certificate date with your profile creation date. If they have any question, they will send you 'Procedure of fairness' letter and ask for an explanation. It is better to be transparent and does not hide any information from them.
Regarding your CIMA, leave it on WES to decide. If they are proving it as a valid diploma than you are good to go and you can submit your one single transcript with a letter of explanation or a letter from CIMA that you are exempted from the other 5 papers. Again, I am not an expert. Just trying to help you in your application process.