Are you talking about actual design mockups (PSD files etc) or just directional sketches that will help illustrate ideas you're having about how to improve the pages? If leaning more towards the former, I'd put yourself in a position to not need anyone else necessarily and just focus on creatin...
Yes. Try looking at Salesforce and its suite of cloud solutions like Chatter, Marketing Cloud, Services Cloud, and Sales Cloud. Let me know if there's something around the same I can help you out with.
Perhaps. You have to consider how your product is used and how the users will sensorially interact with it. If you have a website, for example, you could probably assume similar US and UK usability -- but now consider layout for Semitic languages which are read right-to-left -- or consider ideog...