What’s an example of one of your categories that works? It looks like your site is mainly Pages. You may need to visit Administration > Settings > Permalinks and update your permalinks.
Please talk to your host (or your ISP) about forwarding email.
As for your lost tech person, please consider posting a “New Job Request”  to have a professional work with you, or consider joining and soliciting professional assistance from the wp-pro mailing list .