Change of existing website

Hi, I have an existing website [login to view URL] and [login to view URL] which have a booking system page (connecting to a back-end database), that I need to convert from Massage to Chefs. In particular I need the following: 1) Change the booking system on both sites (just to change few things, the main booking will stay the same) a) Things are just to change the times so instead of 30 - 90 - 120 mins to be 120 - 240 - 360 mins and that cost 150 euros - 300 euros - 500 euros respectively. b) Change number 4 tab (with the body) into type of kitchen... c) Then also change the next form to reflect the new times as well as the Paypal buttons / account that is connect it with this so that the total amount is reflected. 2) Then to change the back end (which is in [login to view URL] control panel), to add a new database into my existing account that will connect to the booking page as it is now but just need to change the configs php pages etc)...not sure how to do that. Not a big job for someone who knows. That's all. Shouldn't take too long for a developer who knows his stuff.... I will send you all details of the accounts (paypal, justhost etc) once the project is confirmed. Thanks