Add SSL to single page

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I have a C5.6 site and I want to add SSL to a retreat application form as we ask some personal information. I don't want the whole site to be SSL. I see there is the Force SSL Add On that might do this.

The other question is, I'm completely new to SSL so if anyone can answer the following:

I'm using Bluehost and I'd prefer to buy a low cost certificate outside. I see something like Comodo Positivehttps://comodosslstore.com/au/positivessl.aspx... and wonder if that's all I need.

I gather this is installed in cPanel but is there anything to be done at the C5 end and anything else I need to know?

Thanks,

Russell