Hi Chris,
Welcome here. :shock: Guys, now is one of few moments I give to someone advice :roll:
Well let's come to your question.... the first means to me to be as a Stanley #78 which is classified as
#78 Duplex filletster and rabbet plane and it's used to make rabbets at the edge of a slab. Only long grain. There's even the other possibility: cross grain. But before the use you must cut the fibers with a cutter or knife at the inner profile of the rabbet.
..the second is a type Stanley Bailey #4 (or #3 someone more expert correct me :roll: ) and it's used as smoother after a fore plane or a #5 which are longer.
Will they be of use for you? Yes! Firstly the smoother togheter with a #5 or #7.
However for more details see
this site which is as a bible of hand planes.
:roll: if may I give an advice to you I'd say: if you are a novice about planning begin with planes which make a surface flat and even.. when you have even a few more experience try to use planes to make rabbets. I made in this way.
This is what is sprung in mind in these few minutes, however this forum and others can give you a lot of advices.
Not always it needs to have some tools to make a job, you must be able to drive they and HOW to tune it. Lokk at somewhat "tuning hand plane" and sharpening-honing handplane blades.
You don't worry to ask any questions, here is a place where you'll found all your answers. :wink:
P.S. I hope the translation of what was in my mind is right. :roll:
Cheers
Gabriele :wink: