About using the planes themselves,
1. just make sure that the toe, heel and the area both immediately forward and to the rear of the mouth are level in the same plane of reference. The size of the mouth is fairly immaterial on both a bailey and double iron wooden body.
2. have the appropriate iron in the plane:
a. largish camber for hogging off large amounts to get a roughly level (but bumpy scalloped) surface. Just remember the wider the board the longer the plane. Use the plane at a 45° angle to the face edge starting at right hand end toe point to the left and work across the piece then start at the left and point the toe to the right. Keep going until the board is "level". Don't be afraid to concentrate on high spots only for a few strokes.
b. Change iron for a straight one with a straight iron or plane to a #6 or longer and then go with the flow of the grain from board end to end to get the face level or there is no evidence of the scallops and have no wind present.
c. If appropriate you can then use a smoother with slight easing of the corners of the iron to remove any track marks and pretty up the surface.
3. Regarding the irons, I have and use 2 of each of the following (the reason for 2 of each comes later):
a. Large camber from side to side for scrub working
b. straight edge fully side to side for use in everything bigger than a smoother and for use in a shooting plane
c. "straight" edge but with eased corners so as to not leave any track marks and used in smoothers
4. Why 2 of each? Simples one set of irons at around 25° for working in softwood and one at ~30-35° for a york type pitch for working hardwoods but without having to change the frog. Where a really high angle of attack is needed I put a 3mm shim behind the iron and the frog to give a proper york pitch when working highly figured or troublesome wood.
5. MOST IMPORTANT ASPECT;
The most important aspect of using a plane after scrubbing is the use of the cap iron/chip breaker. As
@D_W has pointed out before it must fit properly on the iron with the leading edge mating to the iron surface edge to edge in order to prevent shavings slipping under and causing a jam. The cap iron's importance to good efficient working can not be understated. Make sure it is clean edged has no nicks and there is a performance boost if it is highly polished. The pure theory suggests that the cap iron should be as far back from the cutting edge as the thickness of the shaving you will take, now that is not really practical in real life so I aim to have the leading edge around 1/2mm from the cutting edge. If shavings stick then move it back to 1mm with a little tap of the heel of the iron on the bench.
6. When using the plane at the begining of the stroke put pressure on the toe until the mouth is around 2" past the edge being planed and then as more of the heel of the plane comes into contact with the surface adjust the pressure to the rear, so that by the time the mouth passes the middle of the board you weight should be 90% on the heel until the toe reaches the other end of the board where you weight should then be 100% on the heel until the end of the stroke when the mouth passes over the end edge.
These are the relevant basic points regarding using hand planes and working from hewn wood to board by hand that I have learned over the years. Although when all else fails it is a darn good idea to have a toothing plane & a scraper handy when working gnarly hardwoods.
hth