Solution of simple problems

There are 4 website: Jumla,PrestaShop,opencart,Drupal. Websites evolve all the time. I'm not a programmer and if what-thread small a problem,I need to apply for the programmer, I would like to learn how to solve these minor problems. I need a programmer,advised me,i.e. I ask him a question: How to solve this problem? He lurid detail how to do it. A one-time payment.
At the moment, like:
1. To make the merger of 2 domains.
2. In the header you want to change the name.
3. On site mail receives a lot of spam,need to do protection.
4. Domain changed,and the name of the old site remains at the bottom.You need to remove the link.
5. To install a visitor counter on the website.

Specify in the application how much it would cost consultation on these issues