Może się przyda:
May I have your attention, please!
Let me briefly introduce myself.
Thank you for coming here ;)
Today I'm going to talk about ...
First(ly) ..., second(ly)..., finally ...
I'd like to begin with ... / First of all I'd like to talk about ...
To begin with I'd like to point out two things.
Please stop me if ...
I'm going/proceeding to fast
I'm not making myself clear.
In conclusion I'd like to say that...
To sum up.../To summarise...
Are there any questions?
Are there any further question?
I'm afraid there isn't enough time to go into this (any further).
I'm afraid time's up.