One of the very first decisions that you're going to need to make when you get into auto blogging is whether you want to pursue quality, or quantity. This decision is going to form the foundation of a lot of your decisions to come - so be sure to think about it carefully and understand exactly what you're choosing between when you do so!
Generally speaking, many people nowadays opt to go via the 'quantity' route. This means that they spend minimal time setting up each blog but therefore are able to set up more of them. In turn, this would provide you with more streams of income - and that definitely isn't a bad thing to say the least.
Furthermore, since quality isn't so big an issue when you're pursuing this route, each of those blogs could be populated with a lot of content. Admittedly, it might not exactly be of 'stunning' quality, but it should suffice to provide the websites with a necessary boost in terms of traffic. Despite that, you'll find that blogs that go via the quantity route alone are not able to rank amazingly well on search engines, nor do they tend to generate tons of traffic.
On the other hand, if you opt for quality, you're going to either need to source your articles from PLRs (and monitor the quality of those), or you're going to have to monitor the quality of your incoming RSS feeds should you decide to source articles from that option. Needless to say, this is going to be quite a bit of extra work and so you'll find that setting up blogs could take longer.
As a result, you're going to end up with less blogs in total, but then again each of those blogs should generate more traffic and rank better on search engines.
It is worth noting that blogs that focus on quality are a lot easier to sell later on than those that simply opt for the quantity route. In fact, your income potential with blogs that focus on quality is going to be a lot higher.
At the end of the day, you're going to find that your choice here is very much a matter of preference. After all, does it really matter if you have 10 high quality blogs making $200 a month each (for a total of $2,000) or 100 low quality blogs making $20 a month each (for a total of $2,000 as well!). In terms of the profit that you're able to generate, you'll find that the bottom line is always fairly similar.
If you like, you could even opt to balance quality and quantity somewhat.
Regardless, you need to make a decision as soon as possible, because as you can see this one decision is going to define your entire approach to auto blogging. Based on your choice, you can then start selecting sources, choosing the software that you'll eventually use, and actually kick off your auto blogging efforts!