It can mean:
1) "I work now."
2) "I'm working now."
3) It can connote, "I'm going to work now."
"No small job for me now"
It means, "and now that" or, if it is phrased as ¿y ahora qué? it would mean "and now what?"
Ahora es means "Now is'
matame ahora means kill me now
"de trabajo" literally means "of work".
ahora mismo = right now. Donde estas ahora mismo = where are you right now.
I work.
trabajo
Trabajo mas tarde, me voy a dormir ahora, te quiero mucho.
workday
"Que vas a hacer ahora?" means "What are you going to do/make now?"
"Trabajo mi casa no" would mean "I work my house not." If you mean "I don't so house work", it is "No hago las tareas del hogar".