I have a 45 gallon tank and i want to know if my fishes will be good with each other?please help me out?

They should be OK but the dwarf gourami might need somewhere to hide they are very shy. The shark and danios are OK the shark will not be a prob for danios they are very fast swimmers and shark will not be able to catch them. You could put the regular size gourami they are very social but don't recommend kissing gourami or giant gourami because they will get too big. You could put mostly any type of community fish with what you are planning to get. Mollies are good. I would suggest if you want colorful you could try African ciclhids they come in different colors and get very beautiful only problems is they are very aggressive. Also I have shark with Hatchet and sail-fin Mollie and it has never attacked anyone and tank is not filthy because of shark.