Finally trained up for a mining barge. It took a few days to train but now I can rake in the cash from mining. I bought a Retriever with two Strip Miner I's, a survey scanner, two cargo hold expanders, and three medium-sized rigs for cargo hold optimization. This cost about 17 million isks but the mining yield is around 1600m3 every 3 minutes. Going to be making a lot of cash now.
The more important thing is that you can refine the ore and use the minerals to manufacture your own equipment which saves some money.
The hardest part is coordinating mining operations because with a yield like that you need an Orca....or you can use an iteron and make several hauling trips.
One of the ways to make mining profitable is to partner up. One person flies around in a heavy-duty mining ship and dumps everything into a secure cargo container or a jet can, while the other person flies around in a hauler and once every few minutes picks up whatever has been mined. Haul to the nearest station and then trade to one or the other and refine or sell the ore outright.
I did this with a friend yesterday and within an hour we made over 30 million ISKs. It wasn't too difficult and gave us enough time to read/study/screw around on the internet :P
Playing EVE online with a friend is more fun and way more profitable, whether you're mining/hauling or doing missions together.
So I downloaded this neat Android app, EVE Industry Calculator, that calculates whether or not it is profitable to manufacture an item from a blueprint. I found that the Ogre 1 drone can be sold for more than the cost of the minerals used to manufacture it. Unfortunately, this requires a certain level of skills. The better your production efficiency and industry skill levels, the more your profit is. I have level 4 production efficiency and level 4 industry which gives me a decent profit. When I get to level 5 production efficiency, my profit will have increased a LOT because the cost of production will be greatly reduced.
To further lower the costs of production, I did some mining for a few hours. Boring but it does help a bit. If you're going to do this, train up your mining and refining skills. If you're mining veldspar (which has the most amount of tritanium I think...) then you'll want to train up the veldspar processing skill.
The only trouble with manufacturing and selling items is that it'll take a while to sell them off. Some drones aren't bought that frequently or in high enough volume to be worthwhile to sell. I suggest checking out the volume that items are sold by using the Price History in the Market window. The blueprint cost a bit too so now I'm stuck manufacturing a lot of the drones and selling them just to make up the cost of the blueprint.