Replying to Which lights to buy?

I will be starting a short film soon where I want to use lighting to help tell my story. I have two basic lighting situations that will both be shot inside a tim hortons at night. This makes power and size an issue.

1. I have a homeless man who will be walking into the building through a corridor. I want this light to be harsh and gritty but Im not sure which type of light to buy. I was thinking of a green or blue toned direct light. My question is, which lights to buy for this.

2. I have three teenagers to light indoors at the same location but this time with soft lighting. Im thinking soft box as key and china ball as fill. my question here is what bulbs to fit inside of the soft box and china ball. also what about back light, Im wondering if this is realy necessary to conserve a realistic look.

I will be working off of a 7D and possibly an a33 if it helps. I want to stay away from fluorescent light but there will inevitably be some on the location.