Romlang splitting off ~0-100 CE

Hi!

As I've announced several weeks ago, my latest conlang project is
a-posteriori for a change.  I did not have much opportunity since then
to work at it (due to relay organisation and moving), but I'm very
keen on working on it nevertheless.

I'd like to base it on Latin from ~0-100 CE.  First of all, and
generally speaking, what literature should I obtain (and read) to get
an impression of (Vulgar) Latin of that time?

It will be a very conservative conlang wrt. grammar.  Currently, I'm
looking into Sardinian grammar often because it split of early from
Common Romance.

Secondly, and more specifically, what would be the status of final -m
at that time, particularly at the northern border of the Roman Empire?
Would it be feasible for a conlang to assume certain phonological
effects (e.g. lengthening as a side effect of nasalisation) of final
-m?  Or has -m disappeared completely already without any trace?

Further, what would be the status of the adverb?  When did the 'mente'
forms emerge and be used exclusively colloquially to replace the
'-iter' morpheme?

Bye,
  Henrik

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