Sequential Transitions

Source: https://msu.edu/~jdowell/135/transw.html

These transitions are used to signal a chronological or logical sequence.

Numerical:

in the (first, second, etc.) place,	initially,	to start with,	first of all	thirdly, (&c.)
to begin with,	at first,	for a start,	secondly,

Continuation:

subsequently,	previously,	eventually,	next,
before (this),	afterwards,	after (this),	then

Conclusion:

to conclude (with)	as a final point,	eventually,	at last,
	in the end,	finally,	lastly,

Digression:

to change the topic

incidentally,

by the way,

Resumption:

to get back to the point,	to resume	anyhow,	anyway,	at any rate,
to return to the subject,

Summation:

as was previously stated,	so,	consequently,	in summary,	all in all,
	thus,	as I have said,	to sum up,	overall,
as has been mentioned,	then,	to summarize,	to be brief,	briefly,
given these points,	in all,	on the whole,	therefore,
as has been noted,	hence,	in conclusion,	in a word,
to put it briefly,	in sum,	altogether,	in short,