You can re-build a few webpages and contact forms for free, except for website hosting costs. The design will cost extra, if your previous website design was custom made, and has special features.
Use a software like wordpress, and see if you can spend time to learn it. Else use a wordpress developer, and they can give quotes for the rebuild. They can cost $20-$100 per hour.
The website design requires thought, and if re-design is involved, it can cost a few hundred to a few thousand dollars.
And do not spend money on some custom theme or plugins for Wordpress, start with the free ones, they are normally sufficient for such a project.

Give me a call if you need guidance on this.
I have launched many sites, and advised clients in Europe and US on this type of projects.
Basic SEO for wordpress is not expensive either, you can start for free and see how that works out.