cooling system woes

[graemewior]

I have a 2000 boxster s 3.2
I recently replaced my passenger side radiator after discovering the original split, after replacing this part whcich was quite simple, I refilled my cooling system, but failed to realize that bleeding/purging the cooling system required further attention. What i mean by this is I filled the system with anti-freeze left the cap off ran the engine till the bubbles stopped and replaced the cap, and believed all was well. To my surprise my car started overheating after about 10 minutes of driving, i stopped and looked up the bleeding procedure only to find out i needed special tools or a dealership to bleed the system. by this point i had already sprung a leak in my coolant expansion tank, which i am currently trying to find online. tomorrow i intend to check the compression of my cylinders to make sure i did not crack a head as the temperature gauge reads the coolant temp and not that of the engine. If anyone has any suggestions of other ideas please let me know.