Find someone who is great around the green to help you out if they so choose to. For me, it's my friend RJ who is probably winning the club championship right now - he's also a +2. This is my routine, thanks to him.
Anyway - find the right clubs for around the green. For me, it's my PW, 54 and 60. 60 for some flops to get over humps, bunkers etc - 54 to do some nice pitches off the fringe and in the first layer and the PW for longer pitches.
I like to take six tees and set them around the hole, three feet away. I then take three balls and just go at it until I get three balls to sit within that circle.
I work on different sort of shots and lengths.
Once I'm done chipping - which is usually an hour or an hour and a half - I work on putting.
I do the exact same thing I did with chipping, but this time putting. Six stations, three balls - three feet away from the hole. I don't call it quits until I make all of the 18 shots in a row. If I miss one I start over.
This gives you the mindset and muscle memory for these short putts and as well as the mindset of seeing putts being made, not missed.
After that, I move back to six feet and do about 10-20 of those from one or two spots.
There's no point whatsoever in trying to make a 30' putt on the practice green. You're just going to get frustrated and also used to seeing putts not fall. Sure, you'll get speed dialed but you can get that done before a round by just putting three balls across the green.
I do all of this either before or after the range - but usually after. My range session with my irons, hybrid and driver is about 15 minutes long unless I'm working on something. There's no point in overworking your swing - you'll mess it up.
If you want other books to read, please grab copies of all of Bob Rotella's stuff.
Good luck!