Timelapse intervalometer control.

I am building a motion control arduino based unit. As I am more engineer than code writer I'm looking for some colaborative help. I'm wanting to do timelapse of stars on a camera slider. The motor is a stepper motor.

So far I have this arduino control board http://www.ebay.co.uk/itm/271949370951?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

It will need to
• Bulb mode exposure control: from 1 ms to ~ 50 days
• Pre-focus tap (tap focus before firing) (optional)
• Control of up to 3 stepper-motorized axes
• Motion control is shoot-move-shoot (no movements while camera firing)
• Linear ramp up and down of motor movement (make smooth transitions in final output video)
• Linear speed ramping of individual movements (avoid shake and bounce when driving steppers multiple steps)
• Direct manual control of axes (move this far, now)
• Set home/go to home on motor axes
• Alt Input/Output port
• Alt input triggers actions when brought high
• Alt in can trigger: camera exposure, motor movement
• Actions can modify nearly an aspect of program execution (exposure time, camera on/off, motor movement/direction, motor ramping, pause program, stop program, etc.)
• Dual control by both hardware UART and software UART (control via computer and a hand-held device at the same time)

Does anyone want to have a go at writing my code, I have anbsalutely no idea about code. I had a pal have a go but he ended up giving up.

I am prepared to pay for this.