People wonder whether to read Tolkien in Middle-earth time or in the order published. People who know the works recommend reading in order of publication, as this reflects Tolkien's finished and partly-finished ideas in order.
The order is The Hobbit, The Lord of the Rings, [The Adventures of Tom Bombadil if you wish to read the poems], The Silmarillion and Unfinished Tales (you can swap those two over if you want to read the longer Numenor tales before the whole history of The Silmarillion) and then the Histories.
There is no disgrace in giving up any time you've had enough. Tolkien only finished The Hobbit and The Lord of the Rings (and the Tom Bombadil poems) for publication. The stories of The Simarillion were largely written, but not completed as a single work. Christopher Tolkien edited the manuscripts for publication, in accordance with his father's wishes, after Tolkien's death.
The Histories, which comprise earlier drafts, working notes, items such as language essays and draft maps, and some complete excerpts or tales written in detail, are published in order of the original writing. The began around 1917 with the 'Books of Lost Tales', working through the genesis of The Silmarillion and LotR, to Tolkien's ideas in the 1970s at the end of his life. The Histories will be of great interest if you don't mind variant versions and pages of notes.
To integrate the Histories in the order of Middle-earth time, roughly, read HoME 1-5 (omitting HoME 3 if you are not keen on epic blank verse), then 10-12, then 6-8 and the first half of 9, then The Lord of the Rings and then the second half of HoME 9. This will take a long time and a good memory. You should insert The Silmarillion after books 1-5, Unfinished Tales before books 6-8 and The Hobbit somewhere in the middle of Unfinished Tales. Complicated! This is why people recommend reading Tolkien's books in order of publication.
There have been some queries about which "versions" of the stories are "most authoriative". This is odd, as there are no textual variants (other than the occasional typo) of any of the stories other than The Hobbit and The Lord of the Rings. Further, the textual variants of these two books, marked by the Second Editions, were made in 1951 and 1966 respectively and are long out of print. So, unless you are an antiquarian book collector, there is no purchasing decision to be made. The updates to The Lord of the Rings were very minor. The alterations to The Hobbit were more substatial, mainly adaprting Bilbo's relationship with Gollum to dovetail better with the plot of LotR. These are listed in The Annotated Hobbit by Douglas A. Anderson (updated and reprinted in the USA in 2002 and UK in 2003). (And Bilbo apologises for them at the Council of Elrond.)
The text of LotR has periodically been re-set for size reformatting and typo correction (usually managing to introduce some new typos at the typesetting stage, as is traditional). The text carefully corrected by Douglas A. Anderson, which is in most recent editions, is currently held to be authorative. Please note that this text does not alter the story in any way - it just fixes minor type errors.
Sadly, despite some good new cover variations, nearly all the standard format paperbacks seem to be inferior in paper quality, print clarity and in some cases spine stability to the equivalent larger format ("trade paperback") issues, and nearly all the newer printings are inferior to older ones, except in spine stability, which has improved somewhat over the years. Same for the hardbacks (although spine strength has never been a problem as far as I know). It has now been many years since the clearly printed fold-out map of Middle-earth has been issued with the standard hardback editions, although the illustrated editions may have a clear version on the endpaper.