One of the great advantages of being a runner is that it's a very inexpensive sport or workout. All you really need is a safe place to go running and a wearable pair of sports shoes. However, if you plan on running frequently, you should invest in some good quality equipment in order to get the most out of your runs, both in terms of enjoyment as well as performance.
The first thing that you need to focus on if you want to be a serious runner is to get the right pair of shoes. If you only buy a single piece of gear for running, I recommend that you spend your money on a great pair of shoes. Quality footwear can mean the difference between a great run, and injury.
The right pair of shoes will vary by individual. Ideally, you should go to a sports shoe shop and get professionally fitted for a pair of running shoes. The professional will possibly ask you to run or walk on a machine which will measure your stride. This will help analyze the exact kind of step you take naturally when running. The right pair of shoes depends upon your stride.
Once your stride has been identified, you will be presented with the various options in terms of shoes, that would suit you. Simply pick the pair that suits your clothing tastes and budget.
If you go running frequently, you should have proper clothes for running. Men may prefer shorts and a t-shirts, as do many women. However, if you are conscious about your weight, you might like to opt for slightly longer shorts. If you're female, you might like to buy "skorts" (a cross between a short and a skirt) to wear when running. Make sure your clothing fits comfortably. It is preferable to wear clothing that is sweat-wick, and will allow the sweat to evaporate quickly. However, this is not absolutely essential.
If you're a regular runner, you might also like to buy additional running equipment such as music devices, stop-watches, etc.
Running is a pleasurable and affordable sport. However, in order to prevent injury and have a better run, it's important to invest in the bare minimum of equipment that is required.