She has a good reputation in the community, and she rents out multiple buildings.

Please click on the links, give them a read, and share your thoughts in the comments.First is a post that I feel will help not get overwhelmed with the amount of info that is here on BP:https://www.biggerpockets.com/blogs/5868/52761-the-simple-guide-to-getting-started-on-bp The second is a post that will help get you focused with your real estate investing goals:https://www.biggerpockets.com/blogs/5868/52743-im-new-to-bp-any-advice-would-be-appriciatedThe last one is a post that will help you choose an “investor friendly” real estate agent.

Can anyone here recommend a reputable tax services company (or good individual) who is located in SoCal who has experience or is specialized with doing taxes involving out of state real estate investments?

I feel pretty set on what I want to do but some people have told me I need to be careful on what I choose and to make sure to have a fall back plan in case the market crashes or being realtor does not work out.

No obligation, you can still choose any agent you want.

You choose the lender and made promises.

However, doing a quick online search for say "top 10 places companies are moving to" will bring up article that may help you choose a state or city.

I'd suggest starting with some skills that you think you want to acquire (or skills that you may posses or have a natural affinity for) and choose that way.

You can be the manager of the LLC and have signing authority, which allows you to handle all plan investment transactions directly via the LLC bank account of your choosing. 

Let's say I choose an applicant by mid-month - should I give them a couple of days to sign an "Agreement to Execute Rental Agreement" and collect a holding deposit (same amount as the security deposit let's say), and then sign the lease later in the month and collect first month's rent?