Well, once TCPGecko is connected to your console you can do comparisons of any value in the RAM to a previous state (initial dump).
If you do a greater than search you will be left with all addresses which values have increased compared to the previous dump/scan.
If you do searches like these according to a value, for example money/ammo/health you will filter its address out of all others.
In the beginning you should set up TCPGecko to be searching in the right memory range. Set the range itemBox to 10 (the third item). Right next to it set the memory range from 10000000 to 3B000000. If you keep it at 50000000 the Scan/dump will freeze at about 93% because the debugger tries to access an unused or nonexisting memory area.
For value that are always smaller than 255 (or better 127) you should select 8bit as datasice. for enything between 255 and 65.000 select 16bit. anything above 32bit.
For instance, if you want to get a money cheat code look at the current amount of money and enter its value into the search's textBox. Rightclick it and click "convert dec to hex". Now do an equal to search by selecting this as scan methid and click the Scan button.
It may take about 10 minutes to dump the range of 10000000 to 3B000000 (probably even longer if you'r wii u is far away from the router).
While the RAM is being dumped do NOT collect more money!
as soon as the dump is finished you have to gain or loose money. Now enter the new value into the textBox, convert it to hex and do another equal to search. Repeat this until you are left with a few possible results and start poking. if nothing happens, change the room to see if the code is working.
I think this is very basically explained
