Would add Sub 2 & Out of State House Flips. 

Focus on analyzing properties and starting small, like house hacking or buying a single-family home to rent out rooms, while ensuring cash flow and maintaining an emergency fund.

If I owe $350k mortgage and I take out $100,000 HELOC and spend it on say a 6 month CD,And then I sell the house for $700kI would only have $250k profit right?

The houses are just a commodity. 

In short, I can afford the additional $1100/mo cost of a second house, even until I rent it out.I have around $35K in HYSA and emergency funds that I could use for a down payment, but that's less than 20% which would be required for a conventional loan, assuming full purchase price.

If it is then it is a valid comparison.If it is a 2 bed 2 bath condo, then make sure you look at those comps and not the hotel.

It is a corporate housing arbitrage mentoring program.I'm about to sign up but wanted to do my due diligence I want to check with people here if this is legit and if the program is worth the money they as asking for.

If I sell one house per year, it will pay for itself.

I love investing and developing myself, but I do not have enough experience, and this is what makes me hesitant to enter this field.So I want to ask you, what are the ways that will make me start investing in real estate or long-term housing?

I have considered it but I keep things at a flat rate for the exact reasons you stated.I want people to get the exact price when they stay at our lake house.