To add to what Um...Lifting and others wrote, I always thought there should be a little guidebook titled "Care and Feeding of my Gas Turbine." It would only be a few pages long, but contain some easy-to-remember tips. Like:
1. Start into the wind. Air blowing up the pipe is not good.
2. Where possible, always start with a fully charged ground battery cart. Low battery power equals slow N1 speeds equals low airflow and higher temps. High temps at start are your enemy.
3. When possible, don't stop and restart. Keep the blades turning. Starts (cycles) stress the hot section. Better to keep humming peacefully at idle.
4. The fuel control (very noticeable on a C20) goes through a couple of fuel schedules or ramps. The initial lightoff will see the the TOT gauge scream to yellow line, then come back down. That's when many new pilots relax, but forget that the second schedule starts soon after, sending another schedule of fuel into the combustor. That second spike can be just as tricky, especially if N1 speed hasn't built sufficiently. Keep your eyes open.
5. Starting uses all five senses, not just the eyes. Listen for the tick-tick-tick of the igniter. If there's no tick, or if the igniter is intermittent, don't light off. Smell more of the sweet aroma of burnt kerosene than usual? You're probably downwind. Feel the rocking of the ship as the rotor blades swing reluctantly into motion. No rocking? Are your tiedowns still on? (it has happened).
Your turbine is like a good pet. Care for it well and it will serve you well for many years. Abuse it, and it will bite you.