Does anyone know anything about gardening?

The bigger the heap, the better generally, so if you've room make one using old pallets. If you do go for a bin from the council, then a mix of material is good, but try not to put too much grass, assuming you have a lawn, in it, that slows it down. Paper or cardboard, well shredded, can help. Don't put anything other than vegetable waste in it from the kitchen.

My 2p is decide how much time & energy you want to commit.

If you want to get super keen then heat and size are your friends. For e.g. GQT's Bob Flowerdew uses old chest freezers with the guts ripped out, part buried and spray painted to hide.

Then it's a case of adding layers of stuff that feeds it.

Personally I don't have time for any of that, so just throw everything in a tardis and dig the bottom out in autumn / winter depending on levels and throw it on the beds to break down further. I don't use any for potting as can't guarantee it's got hot enough and don't want to risk it.

I've now got a second spinning drum which I planned to put all the tardis contents in to store and break down further. I hoped that being theoretically tippable it would make emptying easier.

We've got a little 18l bokashi bin in the kitchen, when that fills up I transfer it to the big 300l bin outside then cover with shredded paper that I wet down... No grass clippings as, like @andyp says, they take much longer to break down... Repeat this process and you'll be fine...

Makes great quality compost... Too hot for worms so we've got a worm farm in a shady spot as well, the worm castings and tea are amazing for the garden...