2. It is a grainy film. If you can get away with ISO 1000, I would use T-Max 400 instead, since you don't like grain. If you have to rate it higher than 1000 to get the exposure you need, you'll have to compromise. Either use the T-Max and get less grain, but very poor exposure, or use the Delta and get an extra stop of exposure, but much more grain. I'd try both and see what you like best.
3. An incident meter is ideal, if light levels are high enough to get a reading. But if you use your in-camera meter, you just have to make sure you set the EI to the number that will give you hand holdable shutter speeds, instead of letting the camera read the DX code on the cassette. Be careful of backlighting and/or other contrasty compositions when using an in-camera meter. They can lead to terrible underexposure.