Personally, since it's your first restoration, I think I'd start out on something small, like an older push mower or maybe even a 2 wheeled David Bradley. I see so many guys wanting to get their feet wet by starting a full blown restoration, but after getting the project apart, and seeing all of the misceallaneous pieces and parts, their mind is blown, and they loose interest, thus not completing the project. Start with something small on the first one, just to see if you are going to like prepping and painting. It's a lot of hard work, time and patience. If it works out that you enjoyed it and want something more, then sell the project that you finished, and use that money to buy something bigger. I'd just hate to see you sink a lot of money into buying something that may not keep your interest.
Whatever you decide to get, I highly recommend that you find a parts manual, and an owners manual for it. Take the time to sit down and read either one or both, from cover to cover, at least twice. Do this before you disassemble your first part. This will aid you in determining what part effect the other, and will ease your time in reassembly.
Good Luck to you, and we hope you do well. Please post pictures of before, during, and after, so that we can follow along with you, and help you out if needed.
Very good advice, thanks