if YOU MUST till to get something ready quickly for Spring..do as much as you need..but leave the rest for the chickens and a deep mulch to take care of...tilling destroys so much in the soil..so only do what you really must do to get in a few vegetables for your family for this year.
then begin to smother the sod with heavy mulches..or strip it with a flat shovel and a pitchfork..set it aside..dig a little soil out if you want, put in all the
wood products you can find or
compost or whatevery organic stuff you can..turn the sod upside down and pile the set aside dirt over top of the upside down sod ..maybe throw in some mulch between if it is availble..
and plant right in this..mulch your plants when they are up on top..this is kinda a hugel bed and
should be pretty good for things like potatoes and sweet potatoes and lots of other things the first year.
the second year it should be a really good bed.
allow the chickens to do the rest of the work..let them strip and
feed an area and them move them to the next area..
get your
trees in right away.