I hope it works for you... and like I said - if you have any questions - feel free to ask. I will try my best to help you.
Oh and thanks to [link]
I really learnt a lot from him!
Here's the cloud map [link]
The NASA Visible Earth website [link]
You will find the land brushes here [link]
Here's an example of how a planet can look like [link]
(if you want to see some more, just check my gallery)
Please comment and let me know if it worked... I would love to see your planets. Thank you very much!