Creating a members only paid area of pages

Hi,

Looking for some advice as I am by no means a web designer and I have built my new website on here at Squarespace but its all very new to me how all this works and I am the least technical person you will ever meet...

I am subscribed to the 'Business Plan' and I want to know if I can add a member only area to my website that would take users into a bunch of pages that I would create that they would pay to access that content. My plan is to write some Indepth tutorials regarding how I do my work and that content has a value so I don't really want to simply put it out there, hence looking at a paid area. 

I have no idea how to do this and whilst I am keen to look at this I don't want to change my subscription the way it is at the moment really too much or indeed change how my site currently content works. Also and importantly I don't want to make any changes that may impact SEO negatively, or course.

I would be very grateful of any advice on if I can do this and where / how?

Many thanks in advance.

My website is at www.ambientlife.co.uk 

Thanks in advance for any help offered.
Tim