#1, I'd advise using FS2_open instead of Retail, and then check the MP forum where there already is a link to a step by step walkthrough of how to do it.
#2 is pretty simple:
Step 1: Get
Turey's Installer and run it from your Freespace directory. This will download a bunch of mods, as well as upgrade your Freespace installation to 3.6.9 if you are using an older SCP build.
Step 2: Run the SCP launcher, and go to the "MOD" tab.
Step 3: Click "Select MOD", and pick the folder for the mod you want to play (such as Derelict).
Step 4: Click "Run", and then select the newly available campaign from the campaign room.
Step 5: Have fun.
For campaigns not included in the installer, you unpack them to a seperate folder in the FS2 directory, after which you can select them as shown in step 2-5 above.
#3, you'll have to go into a bit more depth about what is wrong, exactly. Are they appearing in the wrong place when they jump in, or are they there from the start but not where you place them?
