alternatives to tilling for new farm soil-building

A super simple question. I am starting a small vegetable farm (1.5 acres) in southern California on land currently covered with grasses and small shrubs. See the attached photo. The soil is decent, with plenty of water available. I know there are issues with tilling (it breaks up soil integrity), but would tilling make sense initially just to loosen up the soil and break up the grasses/shrubs? Are there any alternatives to tilling for a 1.5 acre piece of land? Of course, I'm familiar with sheet mulching but that only seems possible for smaller scales. Any help welcome! Thank you!

A few ways to approach this..

1)   Deep Mulch     Ruth Stout,   Back to Eden,  or Jean Pain     cover all with thick mulch creating a clean slate.      I have done this and took about 18 inches of wood chips to gain the upper hand on what was already growing.     I then dug out holes in that and put in compost and grew.


2)    Tarps / plastic /  sheets of tin.       You can solarize the area to kill off what an you don't want there.     Tarps are a great way to kill off what you don't want.      


3)     Till then do the above.       Some first till then do steps 1,2.       Others Cover with a tarp  kill off,   then water,   allow weeds to grow then kill off again to gain the upper hand.     Often on stubborn weeds I have had to dig out the roots to have full control.