How unoriginal! Yet another guy creating a Romance-based conlang (especially since it's already been covered several times here). Jokes aside, as the title suggests, I'm looking to create a Romance-based conlang. I'd like to point out that I'm not that new to creating conlangs: I've already created one, it's not realistic/natural at all (plus, I didn't make it evolve from proto-fictional-languages, I just created it lol). The reason I'm telling you this is that I have NO IDEA how to create a conlang based on existing languages.
Should I research the phonology, phonotactics, orthography, syntax, grammar, vocabulary, etc. of the five "main" Romance languages (Italian, French, Spanish, Portuguese and Romanian) and mix it all up? Or should I research the phonology, phonotactics, orthography, syntax, grammar, vocabulary, etc. of Proto-Roman and/or Vulgar Latin and make them evolve in my own way so that I end up with my "own" Romance language?
If the answer is none of the above or only the latter, then can you tell me how to go about it?
Thank you in advance for answering!! :)