1)Link to Acronyms:
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=92442#Post924422) If there are bass in the smaller pond then establishing forage will be difficult no matter what you do. If it were me I would rotenone the small pond right now so your new pond starts with a clean slate. If you want to go with largemouth bass you will need to stock bluegill in good numbers to be the backbone of your forage base. If you want to go with smallmouth then do not stock bluegill as smallmouth cannot control bluegill with their smaller mouths. Ponds with smallmouth work well with golden shiners as the backbone of the forage base but other fish like lake chubsuckers/spotfin and satinfin shiners/banded killifish/yellow perch really help smallmouth ponds. Fathead minnows are cheap and multiply like crazy in the absence of predators, you should stock them first as they will help kickstart your pond before they are wiped out.
3) Again if there are bass in the small pond then establishing forage is not going to be easy or cheap. Best results are being seen stocking 30 bluegill for each largemouth. If you do intend to stock predators from other bodies of water then you will want your 30 bluegills per bass to be pretty big so they are not gobbled up instantly by a 2lb+ bass. Stocking a 2-5lb bass is not advised unless you have a really good population of big bluegill that can be your brood stock and resist predation. I have a smallmouth pond and I waited two years after stocking my forage fish to stock yellow perch and smallmouth, a year ago I stocked 7 smallmouth wild-caught that were between 7-10" and fat and then another 7 7-10" fat smallmouth this spring. I recently caught a 15" smallmouth from the pond which tells me they are growing well. I didn't stock larger fish because I wanted to be sure that I had some big golden shiners that would not be eaten by my stocked fish. Keep in mind that stocking fish from other bodies of water can introduce disease and parasites into your pond.
4) My pond is laid out similarly to yours and I aerate it. I have one diffuser in 8-9' of water (pond is 13-14' at it's deepest) that we run in the late spring-summer and another in 3' that we run year round. The shallow diffuser keeps the surrounding area ice free and it seems to prevent the rest of the ice from being very thick in the wintertime.
5) The bass will find a place to spawn especially if you go with largemouth bass. From the pictures it does not look like your pond is an acre, I would estimate a half acre or less. If you want bigger fish then you probably don't want the bass spawning in a pond that size. If you want numbers of small easy-to-catch bass then creating some additional spawning habitat is a good idea. It sounds like your goals are numbers of 2-3lb fish which is a tough goal to meet in a pond that size. To do it you will need to catch and remove stunted fish, feed, and continually stock forage. A 3lb bass eats 30lbs of forage to get to 3 lbs so you see why numbers of 3lb bass are very hard to grow in a smaller pond.
6) Your pond looks like it will be a good smallmouth pond but you should add some rocky structure right away if you want to go that route. In a pond your size you having both smallmouth and largemouth is problematic as the largemouth will outcompete the smallmouth. You could have a largemouth pond and add in a few larger smallmouth for fun later on but you should not expect the smallmouth to sustain a population in the long run with largemouth present. You can also consider adding hybrid striped bass but they will probably need to be stocked from a dealer. If you want to see what I did for my smallmouth pond here is the thread:
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=281556&page=1
