Absolute nightmare and the fun part is I have done 3 CDs and have 5 more to go.
PM me if you fancy a chat about it.
However, if you want a recommendation for a damn good company, though not cheap, then the Cedar Bureau Service is the way to go.
Apart from that there are others here that can do the job for you.
But if what you want is advice on what you can use then you need a declicker, a noise removal plugin and an audio editor whereby you can zoom in on clicks and the like and deal with them (remove, fades etc).
SoundSoap is a half decent noise removal software and X Noise by Waves is also very good.
There are a load of declickers out there. TBH, I use Sony's one built into Sound Forge and it does the job.
You can download Audacity which is free and get going with the pops and clicks removals plus the usual fades etc.
Stretch That Note