It’s a personal choice really as to what is right and not so right. For me, I say use a Retriever. They are cheap and easy to fit. Don’t bother with tanking it. If you are going to get ganked, no amount of shields will save you. Stay out of CODE space and never mine afk, and always keep an eye on Local chat.
Tip… Look up CODE and give the entire corp a bad standing. That way if any CODE players turn up in your system, they will be flashing red in Local chat. See more than two of them… dock up.
As for what to mine? Plagioclase or kernite. Both fetch a good return and can be found in 0.6 systems.
Never take your Retriever into low sec space, you will lose it.
Only deploy drones if rats attack you otherwise keep them in the bay.
0.6 rats will not harm your un-tanked Retriever so long as it’s not sitting there afk.
If you lose the Retriever, it’s not too expensive to replace.
You only need T1 Hobs.
Mining in Eve is all about making ISK. No point in spending millions on implants, expensive drones and ship fits when it would take you months and months to regain the ISK spent.
I run a Mackinaw purely fitted for mining. No tank at all, just fitted for max mining amount and speed. It has two fits, one for ore and one for ice. I only use T1 crystals as T2 crystals are just way over priced for such a small bonus they give you.
So yeah… A Rorqual might mine faster and mine more, but it will cost you billions to get one and could be years of game time before it begins to pay for itself, that assumes it does not get killed. So mine cheap but mine right. Your little Venture could make you a lot of ISK even.