and inspite of how expensive it seems, the higher the Quality of weapons and ammo, the cheaper the entire adventure will be.
when using your airforce, try to pick target in the 1000-1500KM range. Avoid countries under 500.
best way, is to pick a country, at say 1200ish km. start air dropping in SF. clear the air defence normally, using b/f wings, that is 710 bombers, and 1000 fighters. and make sure to dismantle and recreate the bf wings before you run out of bombers or OA2AM, all you'll ever need is 1000 fighters for c3 raiding, and you should never loose any. once you've destroyed the last heli wing, use bombers to clear defences and destroy the factories, then for the cities, and forts, use bombers to clear defenses, and cruise to destroy them. paint when the SF finish dropping, i usually wait for the SF to finish before i start shooting.
once you've take teh first one. you can airlift into the O airports of your bran new C3, and you can roll the tanks into a border country from the new c3. the point of the o ground, is to replace the more expensive cruise to destroy targets. i will often take a group of c3s this way, and when i'm done with them, i'll de-reg all but one, and airlift into that one and take a new group of c3s
a note, if you are going to use bombers to clear air defenses, and HT/HA to destroy them, you'll want to use drones with the bombers. Or use mrmb to clear the defenses. those defensive ground forces need to be removed before you use offensive ground.
for the LRD, you want 160Q or higher, 600 heavy tanks, 600 heavy artillery, and the rest mid range missle batts, MRMB. I'll select a target in the 35km range, using 1000 MRMB i'll destroy the defenses, then unselect the MRMB and use the HT/HA to destroy the target. of course, that is after the helis have been destroyed.