Brand guidelines and webinar powerpoint presentation required

I require a set of brand guidelines creating for a new business of mine and also a powerpoint presentation creating for a webinar. I have templates and content for both but I need them to look fantastic and professional and on-point with my brand. As the content is already done, it is largely design, it should not take too long. This is the first of three webinars, so subsequent work with come if these are to a high quality.