Whether your Lutheran church has a school attached or is free-standing, it needs a website. You might have a childcare, a school, or even a non-profit ministry attached to your church, and you want to promote what you do for the community. The best way to do this is to update your site to a mobile-friendly design that is easy to maintain.
Use a CMS (Content Management System) so that articles can be added. Most newer websites are built on this kind of framework, and examples include WordPress, Joomla, Weebly, Wix, and just about every other service you'll run into. The problem is ease of use, and that's where WordPress and Joomla stand out a bit, once you get the site built.
If you want to use a professional for the initial build, Luthernet Web Design is your best choice for Lutheran church website design. If you want to try it yourself, expect to spend many hours learning how your new system works, and also expect it to look a little more basic than you'd imagined. Your Lutheran school websites are pretty much the same, except they can be even more complicated for a novice to figure out.
If you want to read a decent book about the basics of Lutheran church website design, then buy A Simplified Guide to Church Websites by Brian Jaeger. It can literally save you hours of work and thousands of dollars.
Really, the main factor in the best Lutheran websites is trust. It's hard to trust that a volunteer will get the job done. It's hard to trust yourself to take on such a project if you've never done it before. It's nearly impossible to trust the large online website template companies to help you in any way. It's even hard to trust the local boutique web building firm because of all the overhead it has. The best advice to find someone you trust is to HIRE someone, even a church member, who has done it before and can be a freelance designer. Or find a local freelance web designer. They are all around. If you get the book, you'll know what to ask. If not, just ask several freelancers for some samples, if they can make it simple, and how much it will cost. If you like past designs, don't dilly-dally with details. Just get the site built and start adding content, since that's the most important part of your new Lutheran website.