Just to get you started.
Here is a site where you can learn languages about web dev building bricks: html, css, js, xml, php, sql.
W3Schools Online Web Tutorials[
^]
Unfortunately, mastering web dev is much more than a couple of ideas or hints. Just mastering the languages and concepts of w3shool site will take some time.
Without knowing your background, it will be difficult to give better advices, remember that some people are programmers because the do Excel sheets.
PS: in any case, I recommend to handover the web project to a colleague already skilled in web dev, because there is no way you can get skilled enough in the time frame of the project.