@yotsuya
Several of those questions about TFA are answered in the book. That is, if you care you know the answers to them, but you probably don’t.
Stuff like the relationship between the New Republic and the Resistance and why Han and Chewie found the Falcon so fast is explained in the movie as well. Also a line or two isn’t enough to please everyone. Some people needs things to be fleshed out a little more.