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I bought a Lord of Plagues model to convert into a Death Guard marine and was wondering if and how other may have done it.

Yup - i've done it. Don't have a ny pics of it & not sure where it is though!
I know I added a back pack.
Also did it before the current Codex came out so was modelled as a Chaos Nurgle Champion.
I bought a couple more because I enjoyed converting him so much but haven't got round to them yet :(

I am interested in trying to add armor but I am unsure how to tackle that idea.

Green Stuff is your friend! Just don't try to do the whole lot in one go. Concentrate on one area at a time.