We keep Shetland cattle, and are really novices having had them less than 2 years.
What Sbom says is important - veal doesn't taste like beef, and as far as can tell to get really good beef you want a slow-maturing breed that goes to slaughter close to 30 months, off grass. If you've only got grazing guaranteed for a year that limits your options.
That's not to say don't try it - if you can get a couple of bullocks to put on the grazing then go for it. We bough a bullock last year so we'd get beef a year earlier (our own cows calved this year for the first time, so we were looking at autumn 2014 before we saw beef), and he's growing nicely.