Questions on Scenery Library

I'm a bit confused about how the Scenery Library works in FSX. I understand the concept, the stuff at the "top" of the library gets precedence over the things at the bottom. However, I was hoping to be able to learn a bit more and gain a bit more understanding.

I've got several products that add entries to my scenery library and, after installing several add on products, I'd like to be able to make sure its in the correct order.

I started with the regular FSX & Acceleration.

Installed UTX & GEX.

Installed REX

Installed ORBX FTX PNW (Although I'm not currently flying there so I have FTX Central set to Default)

Later down the road, I installed "Combat Pilot Series" which added a few detailed airports: Naval bases down in Florida. I noticed at one of these bases, KNPA, there are hardened semi-circular hangars that "float" six to eight feet above the concrete...I'm hoping to figure out a way to fix that...but I suppose thats a separate post or maybe better asked of the Combat Pilot guys.

Just today I installed FSGlobal Ultimate.

I've recently purchased (But not yet installed) MSEv2 for Florida.

So how does a person know what order their scenery library should be in? Maybe is there a newbie's guide or some such to it hiding here on AVSIM somewhere?

Right now...here is what mine looks like (After my recent install of FS Global Ultimate but BEFORE the install of MSEv2 Florida):

1) At the top, all of the UTX stuff.

2) Next, what appears to be a few individual airport, city, or terrain names: Edwards_AFB, Berlin, Longleat, Istanbul, Reno.

3) AddOn Scenery

4) Propeller Objects

5) Global, Generic, & Vehicle Libraries

6) Then more individual airport, city, or terrain names: Las Vegas, Rio de Janeiro, St. Maarten, Oshkosh Aerial Photo, South America, Oceania, Western North America, Eastern North America, Central North America, Western Europe, Eastern Europe, Australia, Asia, Africa.

7) FS Global Ultimate Americas - LM, FS Global Ultimate Americas - CSA, FS Global Ultimate Americas - NAM, FS Global Ultimate Americas - ANT

8) A bunch of "Base" entries, such as "1107 Base" or "0400 Base".

9) Default Scenery

10) Default Terrain

Any help or advice on what should go where, or rules of thumb on how to keep it properly organized so it works correctly would be greatly appreciated.

Thanks!