Trade is mostly about information, but skills matter. There have been multiple attempts to turn 5k isk into 1 billion isk in just 30 days. The most notable attempt was by Bouncer Ricdic. This lead to various competitions and spin offs, but the problem is the amount of work they have to put into trading to make it work. Do yourself a favor and train some trade skills.What skills, though, really depends on what kind of trading you are going to do. Which is another post for another day.
Recommended:Accounting Level 5 - Saves money from fees when selling things.
Broker Relations Level 5 - Saves money from fees when buying and selling things.
Margin Trading Level 3-4 - Each level takes ~25% off the amount you put in escrow when you put up a buy order.
Trade - 4 per level
Retail - 8 per level
Wholesale - 16 per level (Requires Retail 5)
Tycoon - 32 per level (Requires Wholesale 5)
Depends:Day Trading level 4 - Lets you modify sell orders you already have up within 20 jumps. (level 5 for region-wide)
Marketing Level 4 - Lets you place things within 20 jumps up for sale. (level 5 for region-wide)
Procurement Level ? - I don't use this skill, but it lets you place remote buy orders.
Visibility Level ? - I don't use this skill but lets you extend the range of your REMOTE (Procurement) buy orders.
Those that are interested in more details about skills can read a pretty good explanation in this forum post. I will cover the basic mechanics of buy and sell orders in Trade 102 - Basic Mechanics.