Custom forms in joomla

I need to develop a form in joomla, with breezing form. This must be like the one in the attached file. This mus have some adicional features: The user can exit the site and return to complete de the information, so this mus have the change to temporal save the form. The forms, when its finally submited must call a web service, qhe provide it, to save the data other application. Whe need to send just a json string whith the information. Whe need in as soon as posible Thanls