What kind of editing do you want to do, and what computer system do you have in terms of operating system, speed and storage? most computers have something that can do this, and software like audacity is excellent and free. Your type of work, and how good you are with technology is the key here.

Reaper is a great low cost solution. Samplitude pro x4, is my personal favorite for quality and features.

There is so many types of software out there. Therefore it is hard to say what you need, and can afford. Like said, what kind of pc/mac do you have, what OS (MacOS, Windows or Linux)? What would you like to spend, what do you got allready? Have you got a decent monitor system, or quality headphones?

A small list what you need to edit/produce/mix/master music:

A PC or Mac (preferable a young fast one)
Software, from free to you name it......
Audio interface
Monitor system
Headphones
Cabling
Microphone(s)

And when you have all of this, you need the dedication to learn – meaning, it won't work by it self. You will have put in time and efford to master your skills in recording, editing and running your rig.

Don't want to discourage you, but most of us spend years learning on this subject.

It does not only takes a lot of money, but mostly the will to do so.........

I have two collaborators I work with frequently. Both are pianists. Both are 55+. One is now a cubase user, and really into orchestral arranging, which he does every day - he's an avid creator and editor using his computer. He is NOT a computer addict, it's simply a tool. The other has one of my old Cubase versions and the licence key. he has a room full of recording equipment, but is almost computer phobic. He cannot do musical things on it. he comes to my studio and tries to record like he did years ago on tape - so he struggles. given a choice with live audio, he plays CDs or Minidiscs. The computer, with editing software is just too alien for him. the other one for live work is now playing his sheet music collection from an iPad - he's digitised the lot! he swipes to change pages, and uses foot pedals to trigger things and reprogram his keyboards.

Where do you come from using these extremes? I don't quite understand this sentence.

I have used some of the music but now it is old dated

It depends what you are editing.
What does professionnal musician means ? A RockStar, a classical piannist or rape 100% samples manipulator ?
Different activities calls for diffenrent tools..
Tell us what you do and get more precise help ! ;)