You have not told us much but here we go;
AN acre of sod is a great deal of area, which is 43,560 square feet.
You can use a rototiller or a sub compact tractor to rototill ground.
It is no different than using a walk behind rototiller to do the same job
but it will cost you $18.000.00+- to buy a sub compact tractor and tiller for it.
If you intend on doing this and since you do not have a tractor the least
expensive way to start doing this is to rent a walk behind rototiller AFTER
you lay down enough WARPS black plastic to cover a 20-40 foot wide swath
of ground each time and leaving it for 2 weeks and it will kill the sod.
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READ THIS FIRST!!!!
If it is ground with heavy thick brush it needs to be mowed and mowed several times
down to 2 inches in height to get rid of the mounds of brush.
You can always rake it up and start a compost pile to till into the ground later.
The grass pile will smolder and burn until it stops rotting.
1. If you intend to have a garden this large you are better off hiring someone to
plow the acre for you and pay them $200.00 for plowing and mowing it which is
twice the going rate.
2. purchase enough warps black plastic mulch or rolls of plastic mulch from Farm Tek
to cover the acre and concrete bricks from lowes or home despot to hold the mulch down
as it will catch the wind and rip if it is not held down.
3. the sod will die over time and heat up and decompose
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If you know of a vegetable farmer that lays down plastic mulch and grows crops in raised beds
It would be worth asking about hiring them to plow, disc, spread gypsum, lime and fertilizer
for a 1/4 of an acre the first year and go from there.