The best will be to learn some photoshop, there are many free vids on youtube or if you have money teamtreehouse can help as well. From my experience i will say the best will be to take a layout you like, printscreen that page and redesign it in photoshop.
http://www.awwwards.com/ have some of the best layouts there is.
That’s how i learnt to do decent good looking front end designs in photoshop. You can see an example of a design i just finished for my portfolio page, that i will start building soon here
I hope this will help you and good luck
If you are really willing to be a professional designer, can refer the online resources related to designing.
Following listed are the graphic design resources.
I got a lot from this video: