I could be very wrong...
but presuming you are in the US or a country with similar rather sophisticated laws about pharmaceutical regulation, federal legalization could mean THC/cannabinoids are reduced to say Schedule 1 or 2, or whatever lower level of regulation gets the products away from DEA and regulated by FDA. On the national level, this would mean cannabis products being available by prescription. This would be true legalization and great for medical users, with their prescription use presumably covered by insurance. But it could suck for recreational users, with legal, pharmaceutical grade (at least in terms of quality control) products likely needing to be standardized, with genuine corporations (including many of the cannabis hype investment/plan-to-grow companies now out there just waiting for this) likely the only ones capable of dealing with pharmaceutical-level quality control and product standardization.
If there will be a place for small growers in a national registered, cannabis tax-paying legalization context, it would likely require them forming collectives, all growing the same products, much as many farms, e.g., dairy farms, operate in the US.
Also, people claiming professional credentials as former criminals, pot-growers, will likely never get federal licenses, and may not even be hirable for growing operations. Also, hiring pot users to work on a pot farm sounds like an invitation to endless lawsuits.
I presume pot farmers will be like other farmers and hire migrant or whatever workers currently do agricultural work.
Now, there still will likely be an underground economy competing with legalized stuff on the basis of quality, variety and cost (not paying the taxes and having all the overhead of licensed growers). If you want to set a professional goal of being a criminal, that's OK, just as long as you realize that's what you'd be doing.
Otherwise, why aim so low - setting your sights on becoming a minimum wage farm hand? Why not set higher goals for yourself -- go to Oaksterdam University, and/or get a degree in horticulture, botany, agriculture, biochemistry, or even business management, etc. (perhaps, while growing on the side) and then try to get a job in the pot industry? Or why not start planning now to be the owner of a legal cannabis farm, not a farm hand, in which case you will need to learn all about managing a business and employees, financing, etc.
