your best options is to contact a large lawful transport faction relevant for what system your in
eg for bretonia, theres bowex/gateway etc even neighboring transport factions, aslong as the id of your base is not hostile to them
and yes there probably are bad people that go around just wanting to kill bases, you probably got followed or were seen
with supplies, to start out a base need supplies very quick and at least 5 large transports running their asses off to supply it
you might need to put a cloak on a large trans to hide yourself whilst supplying it
other options are to have a good few transports already with supplies docked at nearest stations to where your base is going to be BEFORE its initial build, then quickly put whats needed onto it and start core levels and upgrades