Sure, but you can work your way up.
- low CZ for a few hundred thousand credits risk free
- exobiology for a few hundred thousand credits a planet virtually risk free
- easier missions
- raiding abandoned salvage POIs
That gets you the money and materials you need to get a few upgrades (and you might find some pre-upgraded weapons and suits as well along the way) and then start doing medium CZs, scavenger hunt missions, and similar.
That'll get you the money and materials you need for a more comprehensive set of upgrades and then you can do the high CZs by wiping out the other side.
10 million per high CZ should get you 30-40 million an hour, which is pretty decent even for Horizons earnings. (Especially when compared with space high CZs)
- low CZ for a few hundred thousand credits risk free
- exobiology for a few hundred thousand credits a planet virtually risk free
- easier missions
- raiding abandoned salvage POIs
That gets you the money and materials you need to get a few upgrades (and you might find some pre-upgraded weapons and suits as well along the way) and then start doing medium CZs, scavenger hunt missions, and similar.
That'll get you the money and materials you need for a more comprehensive set of upgrades and then you can do the high CZs by wiping out the other side.
10 million per high CZ should get you 30-40 million an hour, which is pretty decent even for Horizons earnings. (Especially when compared with space high CZs)