My 03 Altima overheated and wouldn't turn over after it cooled down, I'm pretty sure I blew a head gasket, what am I looking at here, I'm totally lost?

The aluminum head likely warped, causing the head gasket to blow. Have the head examined and, if necessary, machined by a qualified machine shop. Also, have the shop thoroughly examine the valves for damage. Repairs will likely run around $3,000+.