Firstly look at & assess you're set up, as like you've said rams will need to be kept separate out of the breeding season but sheep are a flock animal so need company, this can be done with going with wether or tup lambs or other tups, but tups will sometimes fight when introduced to others. Also how many ewes do you have? As the average breeding tup is on average expected to cover 25-75 breeding ewes, In some breeds more that's why in a group of 150 ewes we can have just 3 males. If you've only got 4-5 ewes there's no point in having 1 on site as they tend to get bored & aggressive - so will wander off to sometimes find others.
In pedigree registered lambs we'll just be leaving them entire, sometimes you get some really nice chunky lambs which you think they'll turn out nice & they just don't make the grade, & its about assessing development at different stages for example a ram lamb will look completely different to a 2 year old & again that to a mature ram of say 3-4 years old in its prime, this is easier to see in the more larger commercial breeds, for example in the pic below my Great uncle Tom Francis on the left with the breed winner is handling a mature tup, the others are yearlings or ram lambs, but you can see the difference in size & definition & the differences in the individual lines which they tend to follow. But time & careful selection of you're breeding stock will help you achieve what you want in you're lines.
It's like for example we needed a new bull years ago & we new a breeder who had 3 charolais to look at, 1 was too big & 1 was too small, but we knew what our cows were like. Always remember a ram or a bull is 50% of you're breeding stock so choose wisely.