What details of the speaker's history do you learn in the first poem?

The speaker's history in Blake's "The Chimney Sweeper"
comes in the first stanza:

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When my mother died I was very
young,

And my father sold me while yet my
tongue,

Could scarcely cry weep weep weep
weep.

So your chimneys I sweep & in soot I
sleep.

The repeated
weep in the third line represents a child trying to say
sweep, but being unable to, and of course is also a play on his
crying for having to leave home.  He was very young, in other
words.

This was a common situation in the England of
Blake's day.  Some sweeps were orphans, but many were sold by families that couldn't
afford to raise them.

The job of chimney sweep was very
nearly a death sentence:  the soot in a person's lungs often killed a sweep sooner or
later.     

This speaker is naive and goes on to tell how
he and other boys accept their fate because they will be rewarded later in heaven, going
along with the rationale given to them by adults and the church for allowing such
mistreatment.