It is only worth investing in a domain if you’re going to take blogging seriously and put in the work — and get the proper training to make it work for you. I also feel I should mention that the first step in being successful with blogging is doing your research.You should know what industry and niche you want to work in, have some products picked out that you want to promote, already be familiar with your niche, so you know what motivates them to buy, have an idea of the keywords you want to use to promote said things and so on.