I'm looking for either original Japanese works of Science Fiction / Fantasy, or Translations of English Works.

I'm not looking for 'learn to read Japanese' or anything like that.

Thanks in Advance for Recs, and anyone who might be able to point me in the direction of some links.

Wolfe,

A good place to look for japanese light novels is Baka-Updates.
There is an advanced search feature which includes a filter for type of media (novel, manga, etc...), and genre : https://www.mangaupdates.com/series.html?act=genresearch

List of Sci-Fi novels : https://www.mangaupdates.com/series.html?perpage=50&type=novel&genre=Sci-fi&orderby=rating
List of Fantasy novels : https://www.mangaupdates.com/series.html?perpage=50&type=novel&genre=Fantasy&orderby=rating

if you read in baka-tsuki website you can find english translation of some japanese light novel
I reccomend :
Mahouka Koukou no Rettousei
Log Horizon