Ug, dont use 4 fingers. Some of the fastest bass players in the world only use 2. Personaly I like useing 3 fingers because i like those 30/1 notes. A good way to practice on fingering is to lay your hand palm down flat on a table, then keep a steady drum roll (like a snare) with your Index and Middle finger, and with your Tap once for every 4 times the index finger taps. Once you can do that for 5 mins solid, try this:
Lay your right hand down on a Table. Starting with your Ring finger, then Middle finger, then Index finger make a 1,2,3 roll "du du du". Get a Clock where u can see the Seconds and work your way from 4 beats a second to 30 beats a second. About 6 months before I saved up for my first bass I was Finger tapping on everything. Like most people use knuckles and wrists to make beats, you gotta use your fingers. If you have a drum Machine then Great!. Put on a reg 8/1 beat and follow the high hat with one finger, the snare with another finger, and the bass drumb with another finger.
You can try teaching yourself to use 4 fingers, but i hate to tell ya, Your Pinkey finger is 1 inch short of the longest finger. I play with 2, and when it comes down to hardcor riffs that require me to follow the meanest double bass roll out there, i use 3 (tempo 185ish).
Now when u master playing with your fingers, Come back and ask how to Slap. Slap is the fastest possable way to play Bass out there, and the hardest to learn.