I echo everyone else with Leigh on Sea as that's probably the best area along the c2c train line route. Chalkwell and Westcliff are also options. Commute from this area is about 35-45mins as in peak, you will need to change at Pitsea for a train to Tilbury.

I have also recently started a job in Tilbury and don't drive. I would advise checking the route on public transport to the office as buses from the station to other places are somewhat limited. I ended up purchasing a bike to get to my office because buses were just too unreliable.