If you work in technical services or sales you can make more money than most people can really ever imagine, if you do well at it, think hundreds of thousands a year.
Id do the entry level sales job
Benjamin. As one closer to the other end of the life cycle, 66 this year, with a history of having a real estate jones, get as much cash as possible first. Grow your real estate knowledge and connections with time. While it seems an automatic pathway to riches currently, there are down cycles out there. With cash you will get better deals and terms, and better survive the when stuff justs nasty. There is much more to the story, as you to will learn.
I totally agree with what Margie said. Take the opportunity your sales job will provide and increase your education (knowledge) of Real Estate while receiving a pay check and hopefully full benefits. There are entry level jobs in RE, too many to list here, but probably none that will provide you with $70K a year. As you build your knowledge and network, you can invest on the side but have comfort knowing that a downturn in the market, as Dan mentioned, will not be as brutal because you're still making money in your "normal" job. Good luck - and if sales sound absolutely miserable, you might want to rethink RE investing all together!
You can get a loan broker, insurance, of financial planner licenses. Most CPAs or business majors have all these licenses, plus a RE broker licenses. You dwell on one that you feel most comfortable with. Many broker also carry and do appraisal, loan (two types), home inspection, general contractor, and a professional engineers(in SFBA techie heavy). The more the better because you may find one that serves you better.