You'll have fun making candles - you can add different colours and diferent scents to the wax and makes all sorts of shapes. Most people like candles so you will have a great supply of gifts for family and friends. it can also be a nice small business - sell them at craft fairs and markets.

If you are just starting out make simple candles at first otherwise it can be frustrating as you need practice to make more elaborate candles.

My main tip concerns safety. The wa has to be very hot and can cause severe burns. There is also a fire risk inherent in the process. You will need to have a dedicated candle-making area in which you have room to move without easily knocking things over and which has a fire extinguisher close to hand.

If you spill any wax clean it up as soon as it has cooled. If you spill wax on the floor - wash the area with hot, soapy water as it will be slippy from the grease.

As Fren suggests you need to take care when heating the wax as it can ignite if heated too much. I used to make candles as a child and remember reading that you can buy what I think is called a steamer saucepan for heating the wax. This consists of two saucepans. A lower one which you put water into and the base of the second saucepan sits into the lower pan. The boiling water in the lower pan heats the upper pan. The advantage of this is that the wax is only heated to 100 C or 212 F which is a safe temperature.
When making candles, the wick thickness is important, too thick and the candle burns away rapidly and is smoky, too thin and the flame is small and the candle becomes hollow.
You can buy dedicated molds or using interesting objects from around the house to act as molds. It goes without saying that the mold needs to be cut away or the shape should allow the candle to be released when the wax sets! Oil based perfumes and colors can be added to the wax. I used to try breaking up crayons to act as dyes. You can build up layers of different colors of wax. Whipping the wax also gives an interesting effect. Wear goggles when doing this!

Treat the wax in safety matters as if it were grease, since it is an oil-based product. Have a dry chemical fire extinguisher nearby, never use water. Water will explode in overheated wax, like it would do in hot grease, and just serve to spread the fire. At least have a bucket of baking soda nearby to put out any wax fire if you don't have a proper fire extinguisher.

My main tip is to pour slowly. You do not want to get air bubbles in the jars. They will looks ugly if there are.

I recently just started making candles! You will have so much fun! Have a certain area for making candles. It can get messy! Make sure you use the right wick for the right size candle!
Take notes for how much wax,oil,and color you need for each size candle. That way you won't be guessing.
Keep track of what you spend to start your candle making. It'll help tell you how much you should sell your candles for.