Subdomains and publishing to them?

I have read through the information and was successful in setting up my first subdomain or believe I was.

Main domain www.asmallbusinessconsultant.ca
Subdomain - financing

I created one record with domain name and the next with *.financing and seem to create it just fine. The question is now how do I assign it to a site that I develop. The instructions imply there is a bug and I need to let someone know via email, is that still the case, or can this be done by myself and if so how.

Is there a particular limit for the domains? I am going to create 3-4 as my site with the template I am using cannot really expand too much more and wanted to break it up into pieces, so want to use the subdomains. Using keywords in subdomain will also help my SEO.

So is the best thing to do is create the sites and get them set up and then contact Yola and let someone know which site to assign to what subdomain?

I didn't know I could do this and is great as now I will stop using my domain on another ISP that I have a webtool which is not so friendly and move it over to here.

Thank you in advance.

Karen