Help with Naturalisation Application

Dear friends
I need help with the followings

Do i need to provide exact dates of previous immigration applications like date of applications and bio metric dates?

I need to provide last 5 years address and I have put address dated back till January 2015.Do i need to provide the previous one too?

There is a question asking do I have any Non-applying dependants. I am married and my wife lives abroad. Shall I choose yes and put her details?

Details of trips outside UK-There is only option to put one country in the box. but I visited more than one country at a time . For example I went to Italy, stayed there for 2 days then went to France from Italy. How do put this on the online form? I tried to type 2 countries but the form does not allow, You can only choose form drop down list.

also I understand I can provide documents online and do not need to send any original documents. Can you please guide me with file attachment requirements like should they be in PDF or JPG, maximum limit per file such as 1mb / 2mb etc.
also what is the photo upload soft file requirement?

Thanks in Advance