$/RPK is Revenue Passenger Kilometres, i.e. return on each one passanger flown one kilometre
$/ASK is Available Seat Kilometres, i.e. return on each one seat your aircraft fly one kilometre
These values will not always be high, I run profitable aircraft with red and yellow values... don't worry about them too much. Generally the values should be higher (and green) on short routes (<400NM), but above that they often drop.
At first, your low Company Image (CI) and Route Image (RI) will limit your Load Factor (LF) and thus money making potential - you can boost CI with General MArketing (try a country-wide news/billboard/radio advert), while RI will rise to 100% in time by itself.
As for flight times, any flight with an arriva or departure between 2300 and 0500 will have lower LF, and between 0100 and 0400 will really struggle. Try to schedule so your planes fly either side of these, i.e. depart before 2300 and arrive after 0500 for a night flight... or at least before 0100 and after 0400 in the worst case. This said, even horrible times of day usually make more money than not flying at all.
The key to making money at first is have no more than two types - do NOT get a third type until you have got very well established and have at least 20+ aircraft! Also, try to pick two types that compliment each other - for my liking your DC-6 and Caravelles are too similar, but if the types are avaialble on the used market they are not bad choices overall. There is no 'quick buck' to be made in AWS really, although right at the start of a game world lack of competition does allow quicker growth.
In JA, where aircraft are relativly cheap, you'll want to try to save up and buy an aircraft, thus allowing you to use it as backing for loans to lease/buy more aircraft... I started by leasing about 12 Noratlas, then swapped them to lease AW.650s, then started doing buy-one-lease-one from then on AW.650... and now I just buy them! My second type once I had swapped to the Aw.650 were some lease Britannia's, now being replaced with lease VC-10, until my purchased Super VC10 arrive.