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Regarding the image with text and button, you need to use your image as a section background and then add a Text and Button element to your section.
About the video, add a Gap element to your section in order to fill the space.
Please see our Knowledge Base to learn how to use the elements and also check out other tutorials.
Regarding the slider, there are a lot of variables you can or should use depending on your design so it would be tricky to tell you the specific settings. It would be best that you watch this tutorial from ThemePunch.
I'd also just wanted to inform you that though I've answered mixed topics here, it won't always be the case. Mixed topics often leads to confusion down the road so I'd kindly ask for you to create a separate thread for each topic. The response would be faster that way and we could focus on one topic at a time thus increasing accuracy.