Why not hire an architect to assist you?

http://ths.gardenweb.com/discussions/2339030/please-review-my-plans-help-needed-with-bedroom-arrangement

Can you please tell me where you got this plan from? It is exactly what I am looking for. Thank you.

This is definitely a job that requires a pro...every change will be wrought with multiple potential problems and considerations....that only a pro will be able to recognize ...and work through with you .....to find the best way to achieve your needs....

Can you be more specific? What are the few things that you want to change? Without input from you, your question is too open-ended.

the designer or builder should be able to adjust the plan but it looks like one story house and you will have foundation and load bearing wall and roof beams to consider when you make adjustments; and a pro would be very helpful but changes usually demand a new set of plans that need to go to the building department and the permits they allow.

See if your planning department in your city can recommend a pro to assist you.