PV solar roof top calculations

I am looking to have a PV solar roof top installed on my large rooftop area - which is more than 500 square feet in size. I have a specific brand/model preference for the solar panels, and my primary objective is power generation. I need an experienced freelancer to offer some advice and guidance on how best to achieve this given my specifications, as well as to provide an estimate of the costs involved. Please reach out if you think you can help. Thank you!