Bearings in cup and cone hub bearings will likely be loose (balls) and easily cleaned. The bottom bracket is probably square taper and probably will be fine. If it isn't, replace (UN-26 or UN-55). The headset bearings will probably be caged and can be cleaned by submerging in a solvent (eg parafin, shallow). Take care to note which way up they were before removal to help you put them back the correct way up.
Pedals have bearings but, frankly, they are difficult to service: replace if they become u/s.
Grease: search on here for more threads than there are types of grease, with recommendations.
