1. English bottom brackets, also known as "British" or "BSA" are the most common type of bottom bracket you can find. While other types do exist, you won't find them very often on modern track frames. You also want to make sure the spindle length is correct for the crank you're planning to use.

2. The 725tr frame uses a low profile headset, also known as "Internal", "Zero Stack", "Semi-Integrated", etc. Cane Creek ZS-3 is a good, inexpensive option. Make sure it's 1 1/8".