Nothing is better than sowing seeds, watching them germinate and pricking them out!
In the past I have had the luxury of a greenhouse which can make it easier, but I have also had success growing trays and trays of plants in a caravan - one that I was living in!
This year I am starting some seeds in a shed in my courtyard, they are in small trays with propagator lids, the trays are sitting in a clear plastic storage box wrapped in bubble wrap, I have monitored the temperature and it is around 16 degrees so I have chosen seeds that require a germination temperature of 15-20 degrees.
I also have some in pots and small trays on the kitchen window sill, fortunately we have a blind so they can't be seen from inside, otherwise I think my wife would object! The temperature has not dropped below 19 degrees and is usually over 20 degrees. I cover the pots with cling film and even have some in a detergent liquitab box, it's quite an effective propagator.
This year I have bought some seed compost but still pass it through a garden sieve, so far I have found a lump of coal in one bag! I am gardening on a budget so have not bought vermiculite or a heated propagator, but so far things are going well, my hanging basket tomatoes have emerged and there are signs of violas germinating - and it has only been a week or so!