There are also some trade opportunities, find out where agents are located and then buy drones/ammo to sell in those location at a reasonable markup You’ll find you can make a bit of money trading nobody is bothered to fly a few jumps to jita to stock up missiles if it is in the same system at a good price.
I used to haul capital ship jump fuel from jita to 0.5, almost doubled my isk every time i did a run.
New player here as well. I’ve been doing combat sites and then following up on any level 3 or 4 exploration sites that I get. Doing those combined with selling all of the deadspace modules and blueprints I find has netted me a little over 2 billion isk since I started (about 5 weeks).
A quick note: what you do in Eve stays with you.
So while killing miners and looting them may be a good short term idea, longer-term people may look at that bit of your past less favourably.
Actions have consequences.
So saying even nice happy Security mission running has an impact. You can often end up with negative standing to one of the factions that leads to hassle later on.