Honestly, when I bought my camera a couple of years ago, the first thing I learned is that lenses are very expensive, more than the body in many cases. therefore, to justify a better glass and spend your hard earned money is to be sure absolutely sure what you are doing. However, to be all rounded I would get the 55-250 as well for now.
I think and each individual is different;
1. learn about photography and all the elements that are involved in forming an exposure and make sure you really understand them.
2. you have a cracking camera, so you need to learn it and if the manual is not enough get a book dedicated to your camera. There are many online tutorials that explain every menu option. You tube can help as well, just search for depth of field, aperture etc.. and it will give you ideas.
3. go out and practice as much as you can. To be honest, I work 12 hours and had no time to go out and learn.So I learned at home, do experiments with lights (WB), aperture, shutter, depth of field. I learned all these using my kids, toys etc...
4. When you have gained confidence in talking about them without referring to manuals and you find out that the kit lens is not good enough any more then it is time to think about spending money on lenses. I am a bit slow and took me a good year to learn ;-)
5. practice practice practice ... ask question, Google , youtube and you will learn fast if you really like photography

let your passion drive you even when it seems boring sometimes and mundane but you need the skills to advance..
there are many more you will need to do and you will find them as you go forward and improve.