If I were you I would either lease out the land or buy a few cows instead if you are intent on getting cattle for your own use, money-making or otherwise. We raised stockers before and indeed they are a bit more labour intensive than cows are: more so for you if you are not familiar with signs of cattle getting sick, what to feed, vaccinations, etc.
When we first got our stockers we'd have to vaccinate them as soon as possible, then follow a month later with booster shots. Between that time the new calves had to be watched daily for signs of illness like pneumonia or shipping fever, because shipping fever, especially with calves that have come from a livestock auction, will always hit a few days later, and you NEED to be there to catch the initial signs of snotty noses, coughing, lethargic behaviour, etc. so you can treat them ASAP. If you don't catch them soon enough, you can and will loose them.
If you buy calves that are 500 to 600 lbs (or 5 to 6 weight) you will have to train them to eat from a feed bunk or bale feeder. Calling them to get their attention, feeding them when they're hungry, putting the feed out where they have easy access to them or is where the designated feeding area is are some methods to use to get them to eat. When we introduced silage to our new stocker steer calves, we'd put it on the ground for the first few days until most were looking forward to getting fed. Once we got a number that were interested, we could start feeding them in the bunks. We wouldn't wait until ALL of the steers were looking for feed, we'd be waiting until most or more than half the herd were eager for more. Because once you get one interested, most or all the rest of the herd will be interested too.
What you feed is also important. Sometimes grass isn't enough to feed stockers, if you want them to gain well enough to be sold in the fall. Not only should the grass be of good to excellent quality, but if the grass isn't as good quality as you need to feed young cattle like stockers, you need to supplement pretty well daily with concentrates like grain. It will hurt the wallet if you want to sell stockers that are not exactly at a good weight or body condition to be sold to a feedlot.
As far as feed quality is concerned, stockers need around 16 to 12% crude protein in their diet and enough energy content (as in TDN for forage and NE for concentrate) for them to gain weight. Protein alone isn't enough for them to gain weight, they also need energy from carbohydrate, fats and the like.
Yes, stockers are less intensive in the way that you don't have to worry about planning breeding, weaning and calving seasons, but it's a different story as far as health and feeding is concerned.