First of all, you should know what your website will be about. This is the topic of your website. When starting to build a website WIX actually asks you this question, to suggest themes suitable towards your idea. You should also have an idea of what content is needed for the website. Is the website built on images, if it is a photography blog? Or/and, will you need an about page for example?
The buttons/arrows which users can use to move from slide to slide can be edited also within the settings. These can be edited to match your websites theme. An animation can be set for the slideshow. This is how the slides come into view. Most animations are a bit crazy and swirl into screen whereas some are more professional and come into view gently and appropriately for a professional website. To edit any text on the slideshow, just double click on any text. Buttons can be direct to other pages of the website or other websites, both using a URL/web address.
Users can also use search engines such as Google to find images for your site, including social icons. One thing to always remember is copyright. Not every image on Google Images is subject to copyright but most are. Some images may be allowed for non-commercial re-use and others may not be labelled to re-use commercially. Some you may not be allowed to re-edit yourself. You should always watch out for this. On Google you can get around this by clicking on tools and changing the usage rights. This filters images a user can use on their site.
To add social icons, you can simple use WIX free icons or icons from Google. To get icons from with, simply go to the add element once again and click on social. You will see the many icons including Facebook, Twitter, Google+, Instagram, Pinterest, YouTube and many more. Just drag and drop these icons from the social add element to the right part of your page.