Plant the seeds in a place that gets sun most of the day. Lettuce will grow in most types of soil but it will grow better if you can dig in a little garden compost or manure to the seedbed.
Lay a cane or a long stick to mark a straight line for sowing the seeds. Use a trowel, an old spoon or your fingers to create a groove that is 1 cm deep.
Use a watering can to soak the row where you plan to sow the seeds.
Shake a few seeds from the packet onto the palm of your hand, then sow them thinly along the length of the row.
Cover the lettuce seeds with soil with your trowel and mark the end of the row with a marker to show what you have planted in that row.
The salad leaves should start to grow fairly quickly and after one month will be large enough for you to pick a few leaves. If the seeds have been sown too thickly, you can pull out some of the plants to make more room for the others.
Water frequently especially if there has been no rain..
Notes
To grow in a container, fill the container with multipurpose compost, water well, scatter over the seeds and then cover with a thin layer of compost.