For the UI you might have to find someone to do that for you. But if it's just a mock-up and not an actually UI it might be for a reasonable price. Search for

For the UI you might have to find someone to do that for you. But if it's just a mock-up and not an actually UI it might be for a reasonable price. Search for landing page templates. There are a lot that are free, some you have to pay for (but not that much). Another option is to find a design co-founder.