What are Form limitations?

What are Form limitations?

Our company uses many online self-assessment forms. 
1. Can the forms be used online? assuming yes - 
2. Are there are my Field/Cell/Character/Page/rules, or like, limitations so we know if we can work with the form and if yes, how to navigate accordingly.

We need to include 100s' of fields/choices for our clients to pick when filling out a form and that will take them a series of questions.  Are we limited on the number of fields, rules and characters? 

Are there a number of responses we can have per form?

Is there a number of questions we can ask per section? 

Regarding Page Breaks - is there a way to skip directly to the next set of questions without viewing blank pages?

Is there a way to import a google doc form into zoho forms?

Thank you,
AVB