This page will help you start-up your newly rebuilt engine.
Every engine needs what is called an engine break-in procedure.
Remember, do not towing heavy loads, or pull steep hills until your engine is fully broken in. If possible after your first and second oil and filter changes. When your engine was first taken out of your vehicle, some things should have been marked so they can go back in the same way. A bad water pump for example could cause engine overheating. Make sure you install a new one and any other components that needs to be replaced.