You can definitely do a SMB/YP pond with WE as an additional stocked predator but the WE will not spawn so you will need to periodically stock them. If you go the SMB/YP route you will want to eliminate the LMB and Bluegill as LMB will out-compete the SMB and SMB will not be able to control bluegill (unless you have BIG smallmouth when the BG are introduced but even then it's dicey). A forage base would need to have Golden Shiners as the main ingredient and FHM stocked to get your SMB/YP off to a good start (they wont last once long but they boost your predators and allow your GSH to get off a few spawns before the pressure comes), other fish like bluntnose minnows/satinfin shiners/spotfin shiner/red eared sunfish/banded killifish/darters/crayfish/grass shrimp help immensely but your results may vary in your area.
The question is how do you start over? Is there a valve on the pond that would allow you to drain it? Draining it down then liming it and/or treating with rotenone would wipe out most if not all of your current fish population. Draining it down will also allow you to create habitat/structure that benefit the species you want (rock piles and rip rap are great for smallmouth).
If you cannot drain down the pond you can still rotenone it but several treatments might be necessary and there is still a chance that some of the current fish will survive.
Sourcing YP/GSH/FHM/crayfish/RES/grass shrimp is pretty easy but you will want to sort them by hand to ensure no BG or LMB get mixed in. Finding Smallmouth and the other species can be very difficult and pricey but they might be caught in the wild if you have a seining net. For my pond I ordered bluntnose minnows/spotfin shiners/johnny darters/greenfin shiners from Jonah's aquarium and stocked them into my pond just after construction in small numbers then let them spawn for close to two years before adding the YP and Smallmouth. I was able to source YP from a local fish truck but smallies were a different beast. I could not find a supplier who had them in stock unless I wanted to make an 8 hour drive so I caught some from a local river and transported them in my bass boat, I stocked small fish (4-12") that appeared fat and resisted the temptation to throw in 2-4lb fish because I knew they would put a whooping on my relatively young forage base. What I did was illegal but worth the risk. To see what else I did my pond thread is here:
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=413135&page=1Bottom line: a SMB/YP pond is absolutely possible IF you have the time, money, and effort to make it happen. During the 3 year process I often wondered if it wouldn't have been better to just throw some fatheads and bluegill in for a year then stock some largemouth but now that I have BIG smallies and am good growth from my YP and RES I am thrilled that I went the route I did. I have to thank the PB community for all the advice because I would have never figured this out on my own!
