I’m sorry I missed this! I see from your other post you still want it answered.
Is the designer providing the design? It’s very possible a designer will be pretty particular about their design if you’re providing it, so I’d plan extra time for revisions, and I would also expect them to be more particular about the development and would make sure to remind them that you are a beginner and there may be small discrepancies between the design and developed site.
Another element to consider is the portfolio page. I would work out exactly what that is going to be before you provide a price. A portfolio could be just a gallery, or could be full case studies for each project!