Look into "subject to", "lease option", and tax lien investing as these are good options to get around having no or low money to get started. I'm pretty new to investing as well but I've done a ton of research.
As far as banks go there are options there as well but it'll be harder coming from an investor standpoint because they typically have stricter underwriting requirements etc., but shop around. Between credit unions and banks I know there are different loan products available (I mostly use credit unions for my money but have two banks as well) along with other criteria. So you'll have to weight the pros and cons and also realize you may initially have to stay in the property if you use financing. You may also have to do other things like negotiating terms to make a loan product work. For instance, one of my credit unions has a "100% financing" option, but the closing costs are much higher than normal and cannot be rolled into the loan. So if I use that option to buy property without a lot of money to bring to the table, I'd have to do some solid negotiating with the seller to cover that much in closing costs for that loan product to even work for me. A lot is going to depend on your end game with the deal(s) you find. Good luck