Alot of these $ Making Apps will give you extra starter points if you have a friend code or if you click a friend link before installing the App! Make sure you look for the friend code or referral links in each section of the App description. They will be easy to find with $ lines.
Some apps only give points to points to the person who refered someone else.
I suggest you always try to get the $ Apps with a referral link or code to try to get points. Even if a certain App doesnt give you starter points, it is still good to learn how the referal part works so that you can refer your friends and then get referal points later.
Checkpoints will ask you for a friend code right after install. You only have one chance to enter it. If you do not have it ready you will not get any free starter coins. You can not go back and enter it later.