1. Training
2. Approach
3. IFR Clearances from Uncontrolled Airports

Remember all IFR flight plans need clearance from ANY airport/airfield; how we end the approval for that clearance at uncontrolled airports/airfields is quite different. The proper ending phraseology after pilot readback is:

SEA CTR: gives standard IFR clearance

N57SF: reads back clearance

SEA CTR: "N57SF readback correct, hold for release contact me #1 for departure"

....

N57SF: "N57SF we are holding short of the runway at [field] ready for departure"

SEA CTR: "N57SF released for departure. Clearance void if not off by [allow about 5 to 15 minutes from assigned zulu departure]. Time now [give current time]. Contact me airborne, frequenct change approved"

You can also say contact me at any particular fix/vor and/or altitude provided they will be in controlled airspace. Words in "quotes" are the proper sequence to say the clearance, so memorize the pattern.