Hi @Laurie Falk! Sending out your first mailing campaign can be extremely stressful and overwhelming. However, it does not need to be at all. Keep in mind that every investor is going to have different methods and opinions when it comes to marketing. The most important thing is to DO IT and adapt to changes as you progress.
1 & 2. It may help for you to read some articles and material on different mailers and mailing campaign. Your goals and desired volume will help dictate your answer to both questions.
3. Cash is not a requirement to buy a house. But, it is a huge negotiating factor when you do have it. Pre-approval and even Approval will help you close a deal easier, especially when you can provide proof to the seller. It is not wise to get a house under contract if you do not have funds lined up unless you are attempting to wholesale. In that case, you must be confident that you can fulfill the contract.
4. Business names, business cards, logos, etc are non-essential. Most sellers couldn't care less what company you may or may not work for. If they are truly motivated, they care more about if you can solve their problem or not.
I hope this helps you some. The most important thing is to take Action! Finding some local who is currently investing that can assist/mentor you is a huge benefit as well.