Start with IC2: http://wiki.industrial-craft.net/index.php?title=Tutorial:First_Steps
Start with Galacticraft: https://wiki.micdoodle8.com/wiki/Tutorials/Galacticraft_Getting_Started_Guide
Installing a modpack using the Technic Launcher is easy. If you don't already have the launcher downloaded, visit our download page to get the latest version.
Type in the modpack name (VBasic) or paste the following url into the search box.
Finally, click Install at the bottom right of the launcher after you select VBasic from the list on the left. The launcher will handle everything else!
Start with IC2: http://wiki.industrial-craft.net/index.php?title=Tutorial:First_Steps
Start with Galacticraft: https://wiki.micdoodle8.com/wiki/Tutorials/Galacticraft_Getting_Started_Guide