Hi, I am 63 and also went over 30 years without using pot.
I am going to assume you plan on growing indoors. Here are my thoughts... take your time. In fact, don't plan on starting the grow before late Sept. Heat can be a real problem. When the ambient here hits the 70s, I have to turn the lights off for 6 - 12 hours to keep the temps in the tent below 90F.
Take advantage of your gardening skills. Don't start with hydro. Learn the basics, and if you still want to, try then.
What I have is a 8 sq ft tent. It's enough for me, although I do mostly edibles and that is a lot more efficient than smoking.
Don't smoke, vape. Lots of good vapes out there, I have a Magic Flight Launch Box. It's cheap, but good. There are better vapes, lots of them, but they cost more.
With HPS, the rule of thumb is 50 watts/sq ft. I wouldn't go over that. LED is trendy, but the good ones are quite expensive.
I have a 400 watt HPS. 600 watts is the most efficient hps, but not by a lot. Get a digital ballast, and make it a good one.
Fire is something I worry about.
You will also need a good strong fan to pull the air through the carbon filter. Another place you don't want to cheap out.
Hard to beat the GO Box for beginners.
Amazon product ASIN B004PS4B08
There are a lot of different pots. This is what I use.
Amazon product ASIN B0013YYY9U
You will want one of these...
Amazon product ASIN B0013BKDO8
You will want a nutrient free seed starter mix and a light potting soil made for pot. You will need to add a bunch of perlite to that. I have had good luck with Dr Earth Pot of Gold, but I was able to get that locally, so that's why I use that. Just be careful not get something hot that can burn seedlings.
I like to take a fine sandpaper and abrade the flattish end and ridge of the seed. If you get the seed I suggest, it doesn't need that. It's just that since I started doing that, I haven't had a single dud.
Autoflowers hate being transplanted. I just read about a great way to deal with that problem. Get 2 starter pots (some guys use solo cups. Cut the bottom out of one, and then put that into the other one. When it's time to transplant, just remove the lower cup and place in dirt.
Seedlings can dry out easily in that mix. So I start them with a small grow bulb outside the tent. I then get them used to the tent by slowly ramping up the hours 1/2/4/8/16
Your worst enemy is the desire you will have to keeping adding more nutes and water. As the plant grows, it will need more, but everybody goes too far in the beginning.
A fantastic seed for beginners is World of Seeds Afghan Kush Ryder.