When you have completed the tutorial bring up the 'Missions' screen and focus your attention on the 'Build' section as there are several different upgrades and building requests there you will be able to complete in seconds without any difficulty. After you have done that prioritise all training, research and manufacturing. Try to do the Daily, Alliance, and VIP missions as soon as they become available as they are quick to do and earn you a decent amount of Resources and Commander XP when you complete them. Note: Don't forget to return to these sections to collect your reward.