Some obvious things to fit to your venture are mining lasers and drones.
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Venture (Frigate) Recognizing the dire need for a ship capable of fast operation in unsafe territories, ORE created the Venture. It was conceived as a vessel primed and ready for any capsuleer, no matter how new to the dangers of New Eden they might. Frigate) fitting, attributes and screenshots at EVE Online Ships. Rig slots (size): 3 (Small) Venture. A comprehensive database of EVE Online.
But, is that the best you can do?
Let’s show info on the mining laser you are given by the tutorials. Go to variations tab, then press compare. On the compare tool, add meta level and mining yield, then sort by meta level.
You can see the meta 3 do almost 20% better than the ones you are given by the tutorial. The meta 4 do only slightly better. In my area of space the meta 3 cost about 10K ISK and the meta 4 cost 150K.
The big jump comes at meta 5, the tech 2. It has 50% better yield than the base meta 0. But, that takes mining level 4 to use. That only takes about a day of training, and the skill itself will up your mining amount. So, my suggestion is to use meta 3 until you get mining to level 4, then switch to the mining laser IIs as soon as you can.
But, the venture also has a low slot, and into that low slot can go a thing called the mining laser upgrade.
Now, the meta 1-4 of those are stupid expensive, costing tens of millions of ISK. The skill needed to use mining upgrades is rank 4, so it takes more than 4 days to be able to use the tech 2, meta 5 version. For this, I suggest you just use the meta 0 until you spend the time to move directly to meta 5.
As for the mid slots, you may want to consider a survey scanner. The purpose of a survey scanner is to show you how much ore is left in an asteroid, ice and gas cloud. Nice to know about how much is left in there so you can short cycle your lasers (If there is less than you will get from a full cycle, then you can stop the laser early).
The other mid-slots can be used for an afterburner or to increase your shield defense (shield booster and/or hardeners).
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The other slots for fitting a ship are the rig slots. The only rigs that directly benefit mining are for mining drones and deep core mining (which is only done in null and usually in a mining barge). I would use the rig slots for defensive (shield amount and/or resists). If you have an issue with CPU, there is a rig for that, as well as power grid.
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How about mining drones? In my experience, because of the travel time, mining drone actual yield tends to be significantly less than the advertised amount. Also you really should keep that drone bay for light combat drones.