database transfer should be supported by a good hosting
That is backward thinking.

First find a Host.
Research what programs they use: Probably, at least, Apache, Perl, and some SQL database. (AKA: LAMP,) MySQL, (Now Mariah,) is very popular with Web Hosts.
Convert your Excel DataBase to theirs and FTP your DB to their servers.

It is not the business of Web Hosts to convert Excel DBs to another.

If you are unable to DIY, I suggest you go to http://www.vbaexpress.com/ (The Forum owners,) and seek Professional help.

Almost all Web Servers run Unix or Linux. So you might want to install a BareBones Linux on an old cheap computer and duplicate the Stack your chosen Host uses. While I would prefer LinuxFromScratch as a learning tool, You can use the "easier" GNU/Linux as the OS