Originally posted by aslyfox
check with your professional tax advisor:
if memory serves
you may be able to deduct " expenses " from your " business " but you must make a profit within a certain number of years
if not, it is not a " business " but a " hobby " and those deductions will not be allowed, and you have to pay them back
If in the U.S, ditto all of this for me too. Taxes can be a pain, so don't neglect them!
I've thought about making some side cash with photography as well, and here's my thoughts based on how I'd approach it.
1. Establish yourself and get the beginnings of a reputation. Not just on your style, but your professionalism with clients as you do free sessions for practice.
2. Make sure your turnaround time is adequate.
3. Research other photographers in the area to see what sort of prices you may be able to charge. It's likely you'll see a lot of others doing this as a side hustle as well for cheap, so don't set your expectations too high on what the market will bear. If it's not enough for you, improve on #1 some more and try to offer something unique to your clients.
3.1. Don't sell your services too cheap either, expecting to under cut the competition and increase profits through market share. From every story I've read, pricing yourself cheap gets you the bottom of the barrel clients that are often times more of a hassle than you want. I.e. Late to the appointments (or simply not show), show up disheveled, won't listen, etc.
4. Consider doing charity work both for good will and free marketing.
5. NEVER LET SOMEONE PAY YOU WITH "EXPOSURE!" That translates to "I'm a cheapskate that wants free photos and will share it on social media, which will drive almost no one to you as a client."
6. Learn how to interact with clients. If this doesn't come naturally to you, it can be hard to get the creative juices flowing.
7. Invest in props to give you some variety, unless your goal is to make every photo look the same as if it's class pictures day. Props are cheap ways to add value to your services.
8. If you sell prints, get established with a reputable printer so you can deliver consistent results.
9. Be flexible. If you cancel sessions because a client is a few minutes late, no one will want to work with you.
10. Under promise and over deliver! It'll make for happy clients, and happy clients are repeat clients that tell their friends.
Last, and probably most importantly, don't pay random people $139 to tell you how to make money. I'll only charge you $100 for what I just offered.

My point is that sort of program may not be worth it and verging on scam. They may give some tips, but unlikely anything earth shattering, and it'll still require you to do most of the leg work anyway. There's plenty of ways to learn what you need without that expense.
The only caveat I'll throw out here is I'm basing this all on the vague info you presented about the webinar. If the info in the email is little more than "pay us to teach you to make money," then it's a no go at any price. They would have to be offering up specifics on what is being taught so you can judge if it'll even be relevant to you. Even then, that money may be better spent elsewhere, such as an instructional class or props.