Re: Mando Bridges
Normally, adjustable bridges are for arch top mandos (like the F-series) to compensate for the height of the fingerboard, which floats above the top. Flattop (typically A-style) fingerboards are usually attached to the mando top. I believe an adjustable bridge will be too tall for your flattop. I would echo Jim's post above, who says to take your mando to a luthier, they can custom fit a bridge just for your instrument.
GHS mando strings should do you just fine. I used to favor the phosphor bronze before I discovered Elixirs.
As to chord charts, anywhere they sell mandos should have laminated 8 1/2 x 11" cards with most of the chords on them. Otherwise, a music store should have mando chord charts. Alternately, there is a free Mandolin Tools app that you can download (I don't have the URL) to your Windows machine (won't work with Mac). There are also smartphone apps that you can download, but since I don't have a smartphone . . . .
Chords for an octo mando though, better stick with either picking it or using 2 finger chords.
c. '37 Dobro mandolin
'53 Martin Style A
'78 Ibanez 524 F-style
'98 Graham McDonald guitar body bouzouki
'08 Trinity College TM-275 Mandola
"It may not be smart or correct, but it's one of the things that make us what we are. --Red Green, "The New Red Green Show"