However never owned mantis' before.
Then I would advise you to look for another species than H. coronatus. They are not easy to keep/breed. I mean, they are not as hard as I. diabolica, but they are no where near easy either.
Also, the males mature SIGNIFICANTLY faster than females, and live a very short life. So I guess that might be hard to manage for beginners. I always kept the males a bit cooler, but it did not work everytime.
If you like flower mimicing manzids, the easier ones are Creobroter species (nebulosa, gemmatus,....)
When you gathered a bit of experience with these, I could also suggest Pseudocreobotra wahlbergii, they would be a bit more tricky, but far away from Hymenopus.
If you like all mantids, classic beginner species are all Hierodula sp., Phyllocrania paradoxa and Sphodromantis sp. as well as Tenodera sinensis and a few others.
Also, please don't feed mantids crickets, I'm not just copying this from somwhere, I've had bad experiences with that before. Also, "flower mantids" are mostly specialised in flying insects (bees, flies, butterflies, moths...), so flies are more suitable (and I like them better..)
some might tell you, crickets are perfectly fine, and sometimes nothing happens at all, but I wouldn't risk it. If you want to feed it something else, there are so many choices. It will save you a lot of trouble