well if i cant get Xtra metal and oil shuld i first create Lv3 resource structure(so i can attack) and with the remaining resources spam?
Without boosting anything you will already have enough resources to build level 3 farm, oil and metal mines so do that... Also build barracks and the basic scan structure for scans.
Now boost metal and recruit armored units for protection, spams, attacking mines and conquering. You should be able to recruit 22 soldiers max
Be online when the era starts and conquer those that are not online
Also find a good alliance don't create your own
Boosting workers early era does not help trust me, you will be conquered.
Hope that helped and good luck
P.S I am taking that you skipped the tutorial as that will reduce your resources