Formal Writing : Introducing points

On friendly letter, listing is considered to be poor style.  In formal writing also you should remember to limit the ideas, opinions or suggestions to a maximum of three.

Look at the following examples showing how to introduce points chronologically, using the language of formal register.

In the first place,
Firstly,
The main,
The most important point
The first

Secondly,
Another point
Another reason

Thirdly
In addition

Finally
Lastly
The last point
The final reason

To sum up,
In conclusion

Joining points
In formal writing, there are certain ways to join points together, or add more points of the same kind.

When joining similar points, use the following addition words:
Furthermore
Moreover
Besides

Regular exercise is beneficial for health.  Moreover, it may result in weight reduction.
Above sentences are positive.

Smoking can seriously damage health.  Furthermore, it is an anti-social habit.
Above sentences are negative.