There's an old saying, “Rome Wasn't Built in a Day”.
And while it's probably the oldest saying in the book, it really couldn't be more true.
The set up time for internet marketing really varies on a lot of things. For example, if you're just trying to be an affiliate, the time to get up and running would be a lot shorter than if you wanted to launch your own products. However, there's always a learning curve as the world of internet marketing is huge. Some people end up working with coaches and getting up and running very quickly, while others try to learn everything on their own and it may take them longer. There's no way to perfectly gauge how long it will take to turn a profit, but a lot of people go a year without making any money.
So what's the secret to staying motivated and continuing to strive toward success? Well, consistency for one, but mainly realizing you can't get any less successful than you already are. The more you keep at it, the more you will learn and the more of the path you will have cleared up to get that much closer to the finish line. If you stop, that's just guarantee of never getting where you want to go. And remember, when you do finally reach the finish line, you never have to turn back. You found a method that worked for you, and that's all you need.
It took me months to really understand how the basics of internet marketing worked. There's still things I can learn today, and even the “gurus” don't have all the answers. You simply have to follow the principle that you can't get any worse than you already are. If you keep at it, eventually SOMETHING will work for you.
Of course, you will have to be paying attention to what DIDN'T work. This way, you always know something new to try. Additionally, don't be afraid to buy courses. There are tons of courses out there for really cheap that can save you the time and frustration of trying to learn everything on your own. These courses often come with refund policies as well, so if it was something you already knew or didn't want to try, you could always refund it.
Remember, keep at it. Keep laying your foundations and keep moving forward with your knowledge. This is the only surefire path to success.