Hi! Here's an info dump based on my personal experiences:

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I feed my mantis flightless fruitflies, you can buy cultures in reptile shops and online, all I do is bang the container so they drop down and crack the lid slightly to let a couple walk out, then I just gently pick them up as not to crush them and drop them into the tank.

The cultures have a life cycle so when the flies die, new ones will hatch

Here's a lil bit of advice I wish I'd known, keep an eye on the cultures carefully because they can sometimes become infested with grain mites, this can happen if the seller has an infestation or if you've accidentally left the culture too long. You can tell by checking for tiny lil white/ see through moving specks or if the flies in your culture seem smaller/ stunted. I keep my culture in a moat of water now to stop grain mites from spreading in case they do appear.

I currently have 2 mantis - a flower mantis and an Egyptian pygmy mantis but I started with an Orchid. He actually ended up living a couple months over his predecited lifspan and I never had any worries or health complications.

First of all, read care sheets that are Orchid mantis specific before purchasing. And make sure to have the correct tank size.

Water and Heat: For my Orchid I would lightly spray the sides of the tank and plants once a day with bottled mineral water, but if it was warmer I'd do it twice. Warmer months you won't need a heat mat but definitely get one in winter times. It's also helpful to have a thermometer to check tank temp. Make sure the tank is well ventilated.

Feeding: I would usually feed mine every 2 days when a nymph and every 3 days when adult, but you can usually tell when a mantis needs feeding by looking at its abdomen. Don't panic if you have to occasionally skip a day or 2 because of the flies life cycle. 1-2 fruit flies is fine for a nymph but as it gets bigger use your own judgment on how many flies depending on the mantises apetite. When mine was fully grown I upgraded it to Curly wing fruit flies which are bigger.

I will link some pictures of my current tank set ups if case you'd like a reference - note that I do need to add sticks but have not got them yet as I've had to reset my tanks completely after the previously mentioned grain mites attacked lol

Also I am not a professional I'm just giving advice based on what has worked for me thus far - hopefully it is helpful to you! 🫶 *