Wordpress touch ups

Hi, I have a hotel website which needs the following finishing items: The main book now button on the HOME page gives the user the opportunity to select arrival and departure dates. Once the booking button is pressed it goes on to a separate piece of software (booking engine). The dates that the user entered on the website need to be passed to / connected to the booking engine site which is not happening now. The user needs to re-enter the dates (which is clumsy). And.... All booking buttons should open up to a new tab on the web browser. Book now buttons that need this feature are located: Top Right of HOME page Mid / upper part of HOME page Mid / lower part of HOME page FAQ bottom section ALL 17 INDIVIDUAL APARTMENT buttons website is [login to view URL] thank you.