Just some thoughts that I thought might help.
1. Never, ever, ever... ever be afraid to submit an offer. Give yourself an inspection period and clarify that you can cancel for any reason.
2. If you look an a property always submit an offer within 24 hours. Doesnt matter if the property is worth less than you thought or if it needs more work than you hoped. Doesnt matter what the realtor says about the offer. If I spend more than 10 minutes on a property they are getting an offer for me it's standard operating procedure. I've done quite a few residential wholesale deal (Closed 56 in 18 months) I submitted over 700 offers to close those deals
3. Bank REO's can be tricky the LLC comment I saw above works I generally stay away from Bank owned properties. They rarely accept contracts other than their own.
4. There is nothing good that can come out of you disclosing your intentions with the property to an owner or a realtor. One of two thing will happen either they are ok with it because they are extremely desperate or you will scare them off because they do not understand or they think its illegal or whatever reason they come up with. I disclose it only if I absolutely have to.
" I am a real estate investor and am interested in your property/listing. I would like to do a brief walkthrough and submitt an offer within 24 hours. The only contingencies my contract will have is a short inpection period and of course clear title" Get's em everytime they ask very few questions and treat you as a very serious buyer.
If you want to get into it full time I would suggest you submit a minimum of 3-5 offers per day.
Feel free to contact me if you have any questions.