Welcome on the forum!

SERIN
SEROUT
SERIN2
SEROUT2
HSERIN
HSEROUT
are the PBP statement you should use and learn.

Manchester encoding is another thing you should read about on ths forum.

There's a ton of Serial comm here and there... worth a few minutes of search and reading.
http://www.picbasic.co.uk/forum/search.php


Good luck!