You need to workhard to make a best presentation
setps are :
1) create a list of content of presentation
2) present it on whiteboard of room and record also.
3) see how you can make better presentation.
4) present again on whiteboard and record also. you can present using slides also
5) Now make a presentation with litsening your audio and try to make large number of slides with every slide contation minimum information.
This way you can make best presentation in the world. Its my challenge