I'm not sure what this has to do with "orgentissue" but to get back to Earth spacedock either fly to Sol (Top left corner of Sirius) or go into your abilities (-P- is the hotkey) and use the ability called Transwarp.
you don't need to go back to Sol to get more missions, on the upper right hand corner is your map, in that area you will see the Star Trek logo, click that to hail Starfleet and get more missions. The NPCs with a Q next to them will give you more missions
I like another poster find your title confusing. If you are talking about needing missions there is the icon in the upper right mini map area. If you just need training on the game use the sticky thread in the academy section. It has about 30 different links in it. Some archived and some updated. Don't remember the name of the thread but your in the right place and it is a sticky.