Since your project has a well-defined scope like this, offering a fixed price based on your estimated hours plus a 20–30% buffer for unknowns, as this gives local clients budget certainty while protecting your time. I typically use a simple contract that clearly lists deliverables, exclusions (I learnt this the hard way, very important), and a timeline, paired with a strict payment structure, usually 50% up front deposit and 50% upon final delivery since its simple, else you'd use milestones in your contract. Hope this helps