Definitely pick up some Minolta lenses - they are usually excellent choices if you pick the better ones, and can perform in some ways better than many current lenses, and in a few ways they have minor downsides. The better Minolta lenses, especially the G lenses, are excellent - sharp as can be. The only issue you'll sometimes get with them is some minor chromic abberation or purple fringing in extreme contrast situations, as the lenses don't have the modern coatings which most digital-optimized lenses today have.
As for what lenses - the 70-210 F4 is a well loved lens, so if you can find one cheap, it's certainly a decent option. I'd strongly recommend nearly any of Minolta's prime lenses - for cheap starters you can pick up something like a 50mm F1.7 usually for $60-70 or less - it's great to have at least one fast prime for low light work.
Enjoy - you've got an excellent camera, and plenty of room to grow - you can always add the pricier and nicer lenses as you go along...your camera can definitely reap the benefits of the really expensive glass, so keep your eyes out for bargains on those.
If and when you can afford it, the 18-250mm recommendation above is excellent - even with some of the older Minolta lenses you pick up, it is still convenient to have at least one 'superzoom' type lens as a travel/anytime lens - you can pick up the Sony-labeled version which is excellent, or save some money if you can find a Tamron 18-250mm version - it's the same lens optically as Tamron makes the Sony version too, just with a slightly different grip design and focus gearing.
Sony DSLR-A580 / Sony 18-250mm / Minolta 50mm F1.7 / Sigma 30mm F1.4 / Tamron 10-24mm / Tamron 150-600mm / Tamron 90mm F2.8 macro / Minolta 300mm F4 APO
Sony A6000 / 18-55mm F3.5-5.6 / 55-210mm F4-6.3 / 10-18mm F4 / 35mm F1.8 / 16mm F2.8 / via manual adapter, lots of Pentax K mount, Konica K/AR mount, and Leica M mount manual lenses