The Free level account allows you to have one web form in your account and to collect and manage up to 50 responses at a time in that form. There isn't really a way to print FormsCentral forms other than the PDF and saving as PDF is a Paid feature.
Both the "Basic" and "Plus" level paid accounts include the same features with exception of the number of forms you can create, and responses you can collect.
The "Basic" plan is paid monthly at $14.99/mo
Overall the "Plus" plan comes out to less money per month if you are subscribed for a year of each, the Plus plan offers more forms for less money in the long run but requires the one year commitment where the Basic is month to month. There is a "Free Trial" for the first month of the Basic plan so you can see if it works for you, simply turn off "Automatic Renewal" if it does not when the second month comes around.