Dylcyp,
First off WELCOME to the forum!
Your very lucky to have that kind of land in CA anymore. Especially set up how it sounds.
My thoughts as someone born and raised in the cattle/ranching business in CA. The cattle herds in CA are shrinking by the day. The demand is higher and supply lower. The prices are looking to stay high for several years to come.
The hay market is also HIGH due to the drought and only going higher.
As a beginner, I would not even remotely recommend starting heifers. I would also not recommend jumping in with both feet up front.
If it were me I'd do both. Hay and cattle.
I'd start with a good quality group of second or third year cows. Either calf at side or 3 ways. Calf at side and bred back. This will prevent the 1st calf heifer issues but give you young cows to start a good solid herd with.
I'd go commercial at least to get your feet wet.
I'm not sure where you are so I can't recommend good sales. You will start seeing production and more dispersal sales here soon. Especially with the drought continuing.
Bull sales will also be going on and the way they've been going the last few years you can find great bulls for cheep. Of course all will depend on what you buy, cow wise, and your plans.
Hay is in such demand that I'm sure you can work out a deal with a hay guy to work your land for the season. May not cost you but get you hay for your own use. Then fix your equipment as you can. Maybe plant the next crop and have a baler come and bale it for you. Then the following season do it all yourself.
Please be sure to consider your first years supplies also. Minerals, wormer and vaccinations are a must. Have some money set aside for vet bills etc.
Just my current thoughts

Looking forward to hearing more and seeing what you decide.