Welcome to New Eden, hopefully you are finding it an interesting place!
@Wyk_Bathana is right, don’t focus on ISK as a score or a measure of achievement - find out what you enjoy and what interests/challenges you. Most activities in Eve can make a steady income. As always, “risk v reward” exists - and where your risk appetite lies is down to you. But I would recommend going into wormholes and other less safe areas with a cheap explorer (an Imicus or similar) and seeing what you can find. New Eden is a big place, go and explore it - get lost for a while and see what you find.
You’ll possibly loose you ship, you’ll possibly get out with a few million in loot from sites.
Safety : Can i warp to this site ? | EvE-Scout Forums (C1-6 are different classes of Wormhole systems) - “Safe” means the site won’t kill you. Other players? well that’s a different story…
Mission running, mining, trade, manufacturing - all have their own delights and routes to profitability.
Yes, join a corp.
Eve is a social game more than anything else. You can play as a solo player, but the friends you make and the tasks you can complete by working together are where Eve really comes to life. Eve University is a good place to learn, but there are others that are good places to start or develop in. You don’t have to settle permanently in the first corp you find - keep your options open until you are comfortable.
Whichever why you go, do things you enjoy rather than turning Eve into a grind.
Fly as safely as you wish.