DualYeild is right about other botters not sharing, and I do like to see botters helping one another. So ill try to also offer help. But the rough truth is If you have no idea how to make gold and need Pms on what to sell at the moment, then you are only putting a Band-aid over the issue. As soon as the market changes you will all be right back here begging for what to sell now. It takes some work to start making gold but after the original research its just pretty much a rinse and repeat.
1. Check out your proffs and the top proffs on your server. What Proffs are making money. At the moment its cooking, enchanting on my server. But Enchanting will die down after more people reach max and more and more people are raiding providing more mats to the economy. Prior to WoD a lot of profit could be made farming out old content herbs and ore. But with the ability lvl form 1-700 without it as well as the risk involved with farm botting especially in old zones, don't waste your time with farming proffs.
2. Check out the Undermine journal. You can google it if you have no clue what it is. See who the top sellers are in your server and also the top selling items. Now your first instinct is to start making that item, DONT DO THAT. There is little chance you can compete with the top sellers at least starting out. he can just drop the prices to the point you go broke.
3. Use this knowledge to find your niche. Now you know who the top sellers are and what they sell. No one seller, no matter how capable, can sell everything. Look for something that has a decent profit to make, that has frequent use, and isn't a focused item sold by the big competition. (Aim at selling things strong pvp'rs or raiders use). At the moment Food/feasts are strong, by that fishing can be useful.
4. Use Honorbuddy to make your life not a tedious bore. If you cant build basic profiles, you will be a bit limited. But usually you can find something in the forum that will at least work. But if you want to excel it would be in your best interest to at least learn how to make Profession buddy profiles.
5. Repeat and expand. Keep checking out undermine look for places the market needs are not being met. and in time maybe look at pushing out the smaller sellers and moving into others markets.(just know market basics and what to expect. people do not take kindly to others moving into their niches and taking their profit. Its business, and there are no friends in business just competition.
Don't be afraid to try to get creative. Things like mat shuffling used to be a valuable tool. However, in wod its still doable to some degree its not the godsend it once was. If you can master these tools then you can rely on yourself and will never worry about gold again. rather that coming back when the food buff train leaves the station. Although IMO food will probably be the most stable market the whole expansion. at least till 6.1.
Good luck and Happy botting.