Stevie dear, in effect, you've asked for us to write what for us would amount to a book, but most of ur question are already answered here. Try the search function in the upper right hand corner of this forum.
Also, visit the Trip Report section and try typing in 'Mileage Runs to SIN'. Do the same in the UA forum. The UA forum is LOADED. Then do it again in the CO forum. Then again the NW Forum. Then hit the Hilton forum and type in 'CONRAD HILTON SINGAPORE'.
With a little effort on your part, you'll be tied up here for days, and days, and days!
In fact, you may get lost on this site and never make it to Singapore!