What do you have in mind for the style and theme of the web page?
Kiosk with touchscreen. No mouse/keyboard
Logon Page (User Name / Password / Logon button) ... some branding.
Create Transaction Page ... this is the main page for entering fueling tickets. Contains multiple controls (approx 12) for entering details. Some controls allow direct text entry, some have a (select) option to launch a lightbox/pop-up to allow the user to select from a list of options or possibly search. in addition this page contains a toolbar or similar to allow the user to create a new transaction or log out. Finally the page contains a button to allow the user to submit the completed transaction.
Pop up / Lightbox page - provides a way for user to select an item from a list of available options. This pop up is launched from the Create Transaction Page. It contains a list of available options (note the list could be 100s of items long), a search box and button to search for items and, optionally, a frequently used list of items showing the most frequently used 4-6 items.
The web pages will be utilized by users with little or no training, intuitive interface options are critical. Also this is a Kiosk application that will be access via a touch screen, with the user standing in front of a screen ... no mouse or keyboard. All controls should be large enough to be accessed using a finger.