Hi truck5co,
1.
http://www.hitechcreations.com/ahhelp/perks.html 2. Think of Eny as an indicator of "combat value". A plane with lower ENY is regarded as more "capable" or "dangerous". It basicially has two functions:
a) If you fly a plane with HIGH ENY and shoot down a plane with LOW ENY, you get more perk points
b) There is sometimes an ENY Limiter: If one country has considerable more players on than the others, planes with LOW ENY (=the "better" ones) may be disabled for that country. The higher the numerical superiority is, the higher is the eny limiter.
3. Just land on the runway or any other paved surface on any friendly field. If damaged, you may even land at a Vehicle Field and roll onto the paved ground near the hangars.
4. While inflight, bring up your clipboard (ESC) rightclick on map and choose "clipboard maps"