Nothing good comes quickly. Any support services are there to help, but not to do all the work for you. I think you should pay attention to this and try https://loveslides.com/. It has saved me a lot of time. I'm personally most pleased with myself because I've just found a method that simply guides my thinking. 

What topic do you want a presentation on? Maybe I can make one for you?

I totally depend upon that to whom you are going to present like, if you are presenting in front of corporation you need right software because you presenting you firm and it has to be best of the best. but woo present in just class you do not need any special software because there is no hard and fast rule for presentation, like when I have my final presentation of comptia project plus certification in field of security I just present in normal way not a special software. If you are looking for any type of help in presentation kindly fell free to contact me I will help out.       

I usually do presentations on my own. But when difficulties arise, I turn to professionals for help. I think you should read https://slidepeak.com/blog/elevator-pitch-presentation-the-ultimate-guide, so you can better understand what should be in the presentation. I hope you will find it useful.