Your starting process should vaguely be:
Collect seeds above, and weavile larvae in the top right (?s), and then some of the seeds below. You can get all of these without running into enemies. At this point, make about 6 black ant soldiers. Two waves of all 6 soldiers is enough to kill a single spider, which should help you to collect more food and make more ants.
You can see healthbars via ALT or the options menu.