Normally Hong Kong-style lo mein uses egg noodles. If you can find an eggless version (which I did) that's great, but it can be kind of hard to find. Otherwise, any Asian-style wheat noodles would do. For a gluten-free version, you can use rice noodles, or even glass noodles!
You can customise the vegetables to your liking - you don't even have to follow my recommendations here.