Powerpoint template creation

I need someone who can help tidy up some powerpoint slides; create a simple powerpoint template using brand guidelines I already have.

I have some webinars coming up when I want to show some slides, I'm assuming on powerpoint, so need to create and tidy up some slides.

Guidance welcomed too in terms of good ways to do webinar slides.

Timeframe - help in the next week or 2 as I create the slides.