for composting have as many bins as you can - a couple for the really long term stuff and the rest for everything else - but it can take time to rot down in bins and often isn't ready when you want it or in the amounts you need it so I use manure only for spuds and any bed that wants it rich but I reckon i could go a year or even 2 without it but then it would begin to show i think as my allotments are quite intensively used
another idea is in autumn onwards I take all kitchen waste (except spuds, j. artichokes, parsnips) and tip it into small trenches on beds that need it and are empty - fill it in make another, do the same etc and it is incredible how quickly it rots down, improves the soil and bulks up the bed - great :)