I think adding Maroons would be a bad idea especially if you already have other smaller clowns in your tank. I would only keep one type of clownfish per tank. Also, I don't know if Anthia's are really a good fish if you are new to saltwater. I've heard they are quite high maintenace in that they require a lot of feeding and can be tricky to get them to start eating. I'm not trying to discourage you from getting them, but just want to let you know what you could potentially be getting yourself into. Dwarf angels are beautiful fish, but they can be a hit or miss on the "reef safe" part. I've heard that Coral Beauties are generally well behaved though.
Before adding any type of coral, I would first add a cleaning crew. If you are waiting for the group order to go through, I appologize for the wait
I'm not familiar with your tank setup, so I can't really recommend a coral to you just yet. What are your lighting conditions? How much flow do you have in your tank overall? For people new to saltwater, zoanthids and other softies such as Xenia or mushrooms are usually recommended as they are usually more tolerant and require less light than other corals. I would, however, recommend getting frags vs large wild colonies from the store. Less impact on your wallet (usually) and on the environment. Tank raised frags are usually tougher as well. Ask around on the Edmonton group. There are people usually with cheap and/or free frags available to help out the newbies.