I'm new to (Neo-)Quenya and have spent some time with the Ardalambion and Parma Tyelpelassiva courses (plus Eldamo, Parma Eldaliéva, the Bible translation, etc), and I've been trying my own composition/translation to practice and gain deeper understanding. This is a short "test" paragraph I wrote (inspired by the Ainulindale), and I'm interested in feedback: a person can learn a lot by reading, yet interaction helps, too. If this isn't a good place for this kind of thing, feel free to let me know: I don't (yet!) know the community.

Nó quentalë, eryavë Eru engë. Quentalë yesantë írë Eru ontanë Ainur. Antanes ten ëavë; sinen, samiltë vérë sanweltar ar felmeltar ar indómeltar, ar cilmeltar véraltar. Andavë mi eressë engeltë ar sinen tulcaneltë vérë óreltar. Apa tana, Eru yocomyanë te ten yosanien asintë; sinen, alallet óreltar andavë.

Before history, there was only Eru (solely Eru was/existed). History began when Eru created the Ainur. He gave them being; therefore, they have their own thoughts and feelings and wills, and their choices (are: suppressed copula) their own. For a long time (longly) they were (location, so ea-) in solitude and therefore established their own personalities. After that, Eru gathered them together for them to interchange thoughts with each other; in this way, they continually developed their personalities for a long time.

ëavë: gerund of ea-? if so, appropriate word for "being" = "existence"?
sinen: instrumental of root/stem/base "si", used variously for "therefore, in this way, by this means, because of this" (based on tanen but "this" instead of "that")
óre: I used this for "personality", since I didn't see a direct word and its meaning of heart/inner mind/spirit from which personality flows seems close, like individual identity
mi eressë: preposition instead of locative case to avoid -ssesse; would using eryavë as "solitarily", "lonely" work better?
yocomyanë: essentially "togethered"? If so, I like the structure.
ten yosanien: I started with ósanwë, replaced ó- with yo- due to more than two parties, treated sanwë as a verbal abstract noun based on sana-, then took the gerund inflected for dative because of the "in order/for the purpose of" rule (so literally "for them for together-thinking"). Does this "them" need the dative (denoting the beneficiaries) as well as the gerund? Is there a better way to phrase this? Also, I used what seemed like the simplest dative of "te"; are there pros/cons between the alternatives?
asintë: as- "with" + reflexive pron. inte "themselves": is this valid?
alallet: (correct?) past tense of alála- "to continually grow" + -t "they"

Thank you for any help in getting started with this beautiful, elegant language!