Well I usually start by trying to get ranged units ASAP then I max out my farm metal mine and oil rig
Focus mainly on your military, early on without an alliance it can be very dangerous, you need a big enough army to deter your enemies from conquering you.
For your military pick one Chassis
A. Infantry Advantages: Bonus damage against Vech
B. Vechs Advantages: Bonus damage to tank
C. Tanks Advantages: Higher health
Stick with that chassis and build 3 armor and 7 range (inf should be 10 armor 20 range and vech 5 armor and 10 range)