It’s quite hard to beat a well fitted Venture for a new player. A Gnosis is a 25-30m ISK ship and if, as @Raimos_Okel says, you are a few days in that’s a lot of ISK. The Venture is free or at worst cheap - under 200k and rather handy miner if fitted well. It’s fitting it that’s the trick, and a chance to learn.
Meta-miners in the high slots - A Scoped or Gaussian will give you a 20% better mining rate and cost the same as a Miner I.
Go to a pair of Miner IIs as soon as you can. That’s another 25% mining rate for about a day of skill training. But they are more expensive (750k ISK each).
A Medium Shield Extender I, MWD and Survey Scanner in the mid-slots. The Meta medium shields are rather expensive - twice the cost of the hull. It’s a rare case of go for a T1. Scanner so you can see how much is left in a rock before going to mine it (efficiency) and the MWD because you might want to mine on the far end of a belt well away from the warp-in beacon. It’s slightly safer (paying attention when mining is how to stay safe!)
Mining Laser Upgrade in the low slot. You are a miner, you want best yield (m³/s).
You’ll need the Mining Upgrades Skill (an 80k ISK skill book) and about an hour of training time.
Rigs: Shield Extenders and Shield Reinforcers to even out your shield resistance profile and add shield capacity. There’s no mining rigs, so go for something that makes you a little tougher. You aren’t tough, you’re a miner. If in doubt run away and mine somewhere else.
Bung a couple of light drones. I prefer Acolyte I because they are fast, but it’s personal preference - for this case they are rather interchangeable, the NPCs a couple of light drones can handle are more an irritant than a threat.
So what do you get? A ship costing under 500k ISK that can mine Veldspar at about 1.5m ISK/hr. Basically, the first hold full of ore pays for the ship - everything else is profit.
With T2 miners that’s a 2m ISK ship that can mine at 1.8m ISK/hr in high sec.
You’ve also got a spare high slot for a probe launcher (you’ll need to drop the MWD to an afterburner) if you fancy running into Wormholes and mining there. Keep that ship cheap - you’ll either loose it or come out with a good haul. You will take losses - bookmark your exit wormhole!
However - you aren’t going to make your fortune mining; not if you are just starting out. It’s a good way of earning a little pin money, and to see how you like mining (I like mining - there’s a nice relaxing puzzle box feel about selecting and efficiently mining the best rocks, and a mining fleet is quite sociable). There are many ways of earning ISK, try a few. Specialising in something is where the best income comes from, but it’s early for you to do that unless you have a particular burning desire for something.