Magento Extensions - Suggestions?

Hi everyone,

I have a Magento store and I am looking at adding extensions. The only thing is, I'm new to this and I have no programming experience. Is it easy to add extensions?

Are there extensions for ecommerce that you would recommend? Here are a few that I've looking into:

I've been trying to think up things that my ecommerce site needs for conversions, once I start getting traffic. I thought of adding these extensions to my store:

Featured Products Slider

I've been suggested by a few people that I should place a slider with my "featured products" underneath the video on my home page in order to help with conversions.

Featured Products/Best Sellers

Same as above.

Social Media Retail (Facebook)

Being able to sell on Facebook puts my brand and products out there to more people.

eBay Integration

Listing products on eBay can lead to high traffic and more sales.

Google Trusted Stores Badge

Because I have heard that badges allow people to verify and have trust in online stores, I thought that I would try Google's own Trusted Stores Badge for my store to increase conversions. Anyone know of other good badges?

One Step Checkout

Probably one of the most frustrating things consumers face online is a website's checkout system. Simplifying things with a one-step checkout format makes things easier for customers and leads to higher conversions.

Here is the site I am trying to work on:

Your Best Source for Non-Lethal Self Defense Products | Stun & Run Self Defense LLC

Thanks!