Japanese Presentations

I have to make a power point for japanese ..idk how to open and close the presentation. For the opening I was just going to say "ohayou gozaimasu "and begin but is there anything else I can say and what can I say to close my presentation? Whats a good closing statement like "thanks for listening or watching or for your time" something to that effect? and please write in romaji or hiragana (^_^)

If your Japanese is not at a high level I would avoid using difficult keigo (honorific speech) or longer expressions.

Assuming you have introduced yourself or been introduced you could jump striaght in with:

Ohayou gozaimasu.
Presentation hajimemasu. - they will know what presentation means ... if this is for a Japanese class assignment, just emphasise the Japanese pronunciation of presentation ... if it's for business, no need to.

After finishing you could say:

ijou desu.
or
kore de owarimasu.

Wind it up with:
gosei chou arigatou gozaimashita - which is a standard phrase equating to 'thank you for listening'.