I am 5’ 10” y’all and about 190 lbs. my first bike was a 2007 Suzuki C50, an 800 cc cruiser that I bought new. I, too, did not have the money to start small and work my way up. Looking back, that was a mistake. I dropped it many times and had a get off which ended in cracked ribs. I survived all of this and am now on my third bike, a 2014 R3T. I had the C50 for three years before getting a 2009 Kawasaki Nomad 1700 in 2010. I had it for 8 years before another get off which ended in cracked ribs and totaling the bike.
I have had the R3T for a year and am really enjoy it. I agree with the others about it not being a good first bike. I would think a smaller bike, 500-750 cc, would be a better place to start. Probably at the lower end of that range. Get used to the weight, handling, braking, etc. for a minimum of a year. Take the beginning MSF class before getting the bike. Take the follow up class after a year. After the second year, move up to something larger, 1,200-1,700 cc, to get used to the weight and power. After two years on that, depending on your comfort level, then consider a Rocket. I would consider this to be the shortest timeline that would be reasonable depending on ability.
Best wishes with your decision.