Start with some edging bits that have ball bearings on the bottom. The ball bearings help in controlling the router.
Next, you might try some straight bits for making dados. Start with smaller diameter bits like 1/4, 3/8 inch cutting diameter. Set up a board on top of the work to act as a straight edge or use the guide rail system if you have all the parts. Only cut about 1/8 inch deep to get a feel for it. Then try 1/4 inch. Next you might try the same bit to make a rabbet on the edge of a board. The bit will feel different since there isn't wood on both sides of the bit.
After this, try your luck at free hand. Draw a curvy line and see how well you can follow it. Again, start by only taking 1/16 to 1/8 inch off the wood. The deeper you cut, the harder to control. Likewise, larger diameters can be harder to control depending on the bit's function.
I suspect you will have no problems with a little practice and will be glad you made the plunge into routing. (Pun intended)