Followers: Link to profile or just username
Likes and RTs: Post link
To get post link: Right click on the time/date it was posted on and select "Copy link address"
Followers: 100 minimum per profile
Likes and RTs: 100 likes and 100 RTs minimum per post
Followers: Medium (3000 would take a few days)
Likes and RTs: Fast
Followers: A few hours
Likes and RTs: Usually within 0-30 minutes
Twitter followers make your profile seem more popular. Additionally, in some cases they increase your visibility in search results. This makes it more likely for people to follow you.
Likes and RTs will boost your post in search results. This means that your post has a lot higher potential to appear in the top search results for whatever hashtags and text you included.
Note that the followers likes and RTs added by this service are not actual people. They help you gain actual people.