About this topic i would only speak of the first question because i have much thinking to do about all the other questions and im sure you will find this post wite long....so
How do i Resist Morgoth???
On this point i wolud have to agree with Anguirel, in the fact that the Noldor shouldn`t retreat nor hide from Morgoth, I really think that most ofthe battles of beleriand would have been won if only the noldorin weren`t mising something important : Patience and Union among them.
I suggest-build up grand alliances with Elves of whatever stamp, if at all possible. Swear an oath of mutual respect (like that sworn by the Greek princes of the Iliad). Foster connections with Men and Naugrim. With unity, the free peoples of Beleriand could have been greater than a thousand Valarin relief forces!
I know that the odds of winning against Morgoth or any Valar (as diminished and unworthy of the name he might be) are very narrow if not nule at all, but by destroying his armies and cornering him just like in the siege of angband but in a far strict level, a united army of the elves combined with men and dwarves, would have (and suceed) in the task of safekeeping middle earth until the war of wrath, and that would be precisely the task appointed to our Noldorin prince, to create and maintain a true STATE, united and supportive in wich the peace would have lasted for many years.... of course lots and lots of great warriors and mighty beings wolud be at risk and the chances for them to be completely lost are high, and there would have been a NIRNAETH for sure but Just as Tolkien says, when he speaks about the other sons of Finwë (Fingolfin and Finarfin), if they would have not existed (and perished) the way they did, the Noldor would never had the fame and rename they had in the eras to come and all of their great deeds would not exist in the songs.....