A lot of those ideas use should as a word, while they describe one of the multiple paths you can take. It all depends on what your aim is. Do you want to earn a living? Just make games for fun? Increase your skills? Make friends? Each aim has a very different solution.
Game jams are fun, but most of them have deadlines. Personally I’d advice against joining a game jam for your very first game. If you are unfamiliar with the process, it might not be as fun to work under tight deadlines.
My general advice would be, start making small games. Plans are nice, but they can only get you so far. If you reach a point where you’ve made 10 small games, then it becomes easy to make plans that are achievable for your next one. Otherwise you run the risk of planning a game for months, and the moment you start working on it, you realize how overwhelming it is to implement all the details, and be demotivated.
Regardless if you want to earn a living, or just have fun, or network with people, learning how to make games is important.