Don't stick to Mono
What will you be fishing for
For seatrout or smaller fish over cleanish ground 10lb to 15lb braid will do well. You can go lighter as you get more used to braid and how it handles. Use a 10lb - 15lb Flurocarbon leader, depending on the ground you are fishing over. Remember, 10lb braid is likely to be thinner that 4lb line. Learn the improved albright knot or slim beauty knot for joining the brain to mono leader. Use a 2 - 3 foot leader and keep it outside the guides for casting. Repeated wear on the knot from pinging the guides during the cast will casue it to fail.... normally mid cast resulting is the loss of an expensive lure.
For Bass step the braid upto 20lb or 30lb. If your new to Bass fishing and are fishing over some really rouch ground. The 30lb braid is still only going to be as thick as 10 or 12lb mono and will give you s slightly better chance of getting your lure back should you snag weed or a rock. Some of the newer braids are thinner again. Same setup foe the leader just go upto 25lb fluro. Try get a good fluro here as the diameter will be reduced. Tubertini Gorilla is the business.
Move to braid... Mono is for the dark ages and some very specific situations.
Tight Lines,
Kev