Thanks guys. I am wondering if my main lens is a not so great one should I be getting a better shorter lens like a 18-135mm or something instead of buying a super telephoto. Because without my neighbors lens I really got nothing besides my 18-55mm. I don't know, what would you do if all you had was a kit lens.
STOP
Sit down and think and plan of a complete lens landscape/kit for YOU, what you shoot and how you shoot.
Do you want a general purpose (GP) kit, or one more specific to a shoot requirement?
Do you need a specific lens for a specific shoot? How will that lens fit into the landscape?
If you go at it piecemeal, there is a good chance that you will end up with a lens that does not fit the final landscape, and you will end up selling it at a loss.
Here are some kit examples:
Example1: 18-55 + 55-200 + 500
Example2: 18-55 + 70-300 + 500
Example3: 18-135 + 100-400
Example4: 18-55 + 18-135 + 150-600
Example5: 10-20 + 18-55 + 18-135 + 150-600 + 35/2 + 50/2
The plan should also reflect your budget.
Example, the Nikon 200-500 is a $1400 lens. But I don't use a LONG lens enough to justify spending $1400 on it. So I got an old used 500 mirror lens for 10% of the price. Manual focus, but it was "good enough" for the job, and how little I use it.
You don't have to buy it all at once. With a plan, you can think about what lens to get in which sequence. What lens do you need most (get it first), and what is less important (can wait till later).
You can even plan a sequence of lens/cameras, based on your increased earnings over time.
Example: budget 70-300 now, replace with 100-400 or 150-600 later.
The plan is a living document.
As your needs change, the plan should change to reflect your needs change.
As new lenses are introduced, the plan could change.