All grasses need a good place to grow and the best time to fix the soil they will grow in is before the seeds are scattered, so start now with a good, reliable soil test. contact your local office of the University of California USDA Cooperative Extension Service about having that soil test done and also dig in with these simple soil tests to see what you have and what you need to do to mkae that soil into something that will grow good, healthy grass.
1) Structure. From that soil sample put enough of the rest to make a 4 inch level in a clear 1 quart jar, with a tight fitting lid. Fill that jar with water and replace the lid, tightly. Shake the jar vigorously and then let it stand for 24 hours. Your soil will settle out according to soil particle size and weight. A good loam will have about 1-3/4 inch (about 45%) of sand on the bottom. about 1 inch (about 25%) of silt next, about 1 inch (25%) of clay above that, and about 1/4 inch (about 5%) of organic matter on the top.

2) Drainage. Dig a hole 1 foot square and 1 foot deep and fill that with water. After that water drains away refill the hole with more water and time how long it takes that to drain away. Anything less than 2 hours and your soil drains too quickly and needs more organic matter to slow that drainage down. Anything over 6 hours and the soil drains too slowly and needs lots of organic matter to speed it up.

3) Tilth. Take a handful of your slightly damp soil and squeeze it tightly. When the pressure is released the soil should hold together in that clump, but when poked with a finger that clump should fall apart.

4) Smell. What does your soil smell like? A pleasant, rich earthy odor? Putrid, offensive, repugnant odor? The more organic matter in your soil the more active the soil bacteria will be and the nicer you soil will smell.

5) Life. How many earthworms per shovel full were there? 5 or more indicates a pretty healthy soil. Fewer than 5, according to the Natural Resources Conservation Service, indicates a soil that is not healthy.

Here is a link that might be useful: UC CES

stirrup hoe can be used in areas where the plants like vegetables are grown in a line. It has a hoop in the shape of a square or circle. The hoe cuts the seedlings and can also uproot them. This helps in ensuring that the weeds do not emerge again. But in places where the weeds are growing quite close to the main plants, you need to remove them by hand as there is a chance of damage by the hoe.

Mulch is also effective in reducing weed growth. It works by preventing the sunlight from reaching the soil thus inhibiting any growth of weeds. Clippings of grass, branches, hay and other degradable substances like leaves and barks can be used.

Here is a link that might be useful: Organic Weed Control