using arduino mini and gyro module

Hey guys im new to the ardunio world but i have a project due next week ( i just have to have a plan or layout) and i was wondering if you could answer a few of my questions, iam making a gimbal controler using a pro mini or pro micro from sparkfun or whatevers better and small, you have to plug the gyro in and i wanted to run the battery from my phone to the module because there is a cable that can reverse the cycle and draw power out, the input for the cable is micro usb and i know that i would need an adapter to input the cord but what would be the right usb adapter? and will i have to run it through the vcc? secondly on the tutorial the transmitter to send the data to the gimbal was in a remote control but i want mine in the back of a case on my phone what would i have to get to be able to do that and what would i have to get for the receiver and transmitter aswell ( the receiver plugs into an alexmos controller). also would i be able to add a switch into the circit and an led beside it thats not on the board to show on the outside of the case that it was on/off and so it would stop drawing power from the iphone and how would i go about it and i would also like to know how to connect everything to the board like where it goes and how to connect the transmitter and everything, and also what gyro you recommend. i have the code and everything but the tutorial did not explain all of these things well and i was looking for some clarity as i have changed alot of the things iam doing from the tutorial it would be amazing if you could help me
This is the tutorial: http://diydrones.com/m/blogpost?id=705844%3ABlogPost%3A2106482
And this is the reverse power cord( or let me know how to make one on my own or if there is any other better):PowerMe - turn any device into a power source | Indiegogo

Thankyou heaps!!!!!

I can't imagine that how to power the project should be your first concern.

A functioning project with a car battery powering it, making it less-than-portable, is better than a half-function project that relies on a phone providing power. Focus your attention where it matters. When the project works, THEN optimize for power.

secondly on the tutorial the transmitter to send the data to the

I get the distinct impression that your project really is "Find a cool you-tube video and replicate that project". Perhaps you should look for a project that uses a servo to help you press the enter key after some number of words...