As the man says, it isn't rocket science, but it can be intimidating when it's your first turbine. I can offer this:
"The best position to leave the blades in is actually around 30° from the longitudinal axis. You have a lot to look at when you start the engine, and one of the checks is to ensure that the blades are turning by 25% gas producer RPM. This actually happens at around the time of the first TOT peak, by which time, if the blades are set as described, they should be moving into your peripheral vision and you don’t need to take your eyes away from the TOT gauge. If they were at 90°, you wouldn’t see them until the gas producer was well over 25%, without taking your eyes away from the panel. If you put the blades fore-and-aft, there is a slight risk of exhaust gases scorching the underside of a blade, and you wouldn’t be really sure that you had untied the blades anyway."
Although the Bendix doesn't allow modulation, you can get a cooler start by watching the fuel pressure and stop opening the throttle when you see the needle flicker. Be prepared to wait a second or so for light off.
With regard to N1 RPM, don't wait until the engine rotation peaks, because you will be wasting battery power that will be needed later. The Allison book says you can open the throttle at around 13%, provided the engine is accelerating. However, you still need to be careful of a weak battery, which you can get an indication of by listening to how the igniter snaps. Better still, use external power.
One Most Important routine to get used to - if you think you are going to have a hot start, close the throttle first. Don't take your finger off the starter until you are sure the TOT will not go any higher
Phil