"Tengo mucho trabajo" means "I have a lot of work"
You can make this future tense two ways.
1. Tendre (with accent over second "e") mucho trabajo manana (with a squiggly thing over the first "n")
this means I WILL HAVE A LOT WORK TOMORROW
2. Voy a tener mucho trabajo manana (with a squiggly thing over the first "n")
this means I AM GOING TO HAVE A LOT OF WORK TOMORROW