@Brian Walters
I'm a very seasoned investor and I can tell you the LLC is totally worth it.
The LLC is not only about the protection it provides but almost more importantly the tax advantages. I'm not an attorney nor an accountant but I can tell you that both will say that the LLC is the way to go. The start up costs are not even a consideration (or the maintenance costs of keeping one).
Single owner LLCs are disregarded for tax purposes so everything flows to the owner of the LLC. But pass through entities get taxed less than ordinary income which is what you're taxed as an individual who has income.
As far as multiple LLCs are concerns. Many accountants say that you should use series LLCs because the taxes are easier. But I'm reality I think it depends on your state. The LLC laws need to be tested to make sure the series LLC hold up as true impervious entities. Because this is semi unclear In my state (Illinois) I always do separate LLCs for separate things that I will hold for a while (I want a Chinese wall between all different assets I will keep for a while). For simple fix and flips I use a single LLC and reuse it over and over.
This is a lot of info to take in. But if you or anyone has any questions...feel free to reach out directly.
Andrew