I am under the impression that configuring a server to serve 350 simultaneous users with pages that are plain HTML (plus an image or two, no AJAX or similar) with some simple database connectivity (maybe five tables or so, no especially complex queries, and no more than a few MB of data) should:
Not be a particularly difficult task
Should not require an especially powerful server
Should be fairly trivial to test in advance
I don't require any specifics, but confirmation that I'm correct (or not) would be useful.