Crossing two unrelated stable lines gives you an F1 with hybrid vigour and reasonable uniformity, which is the easiest satisfying result for a first breeding attempt. You need one selected male, one selected female and somewhere isolated to do the pollination. Step by step accounts of small scale F1 projects are written up at https://breederregularseeds.com. Expect the seeds to take six weeks or so to mature on the mother, which catches people out on tight schedules.