to the semp forum David, those seedlings do look a tad leggy alright . Most people start off the semp seeds in Jan /Feb indoors or under cover outdoors. This gives them lots of time to grow and reach a good size for overwintering .
My tips for a newbie. ....pay scrupulous attention to labelling any semp cultivars you buy . If the labels get lost or mixed up you're doomed and finish up with what we call a NOID ( no identification plant) No.2 tip , drainage is ultra important, semps rot easily if not planted in a very free draining compost .
There are lots of threads here dealing with the various trials and tribulations of Sempology . Happy reading and semping
PS ,Here's the semp seeds I sowed last Feb , nb ,these will all be noids as the seeds don't come true to type. Of course there's always the chance one of them could turn out to be the next new cultivar