You don't want to put them outside full time until they are pretty much fully feathered (like the picture below) and it's a steady 60-70 degrees outside with sun and no wind, rain or such is ideal but don't wait too long...
...then you need to integrate them using some sort of see but don't...
Red chicks like this are always hard to tell but possibilities include; red sex-links (though they seem a little dark for that), buckeye, rhode island red (probably most likley). Chickens aren't very hard regarding when you can send them to another home as some are shipped as day olds, a few...