id say only like a 2.5amp fuse for just a few leds.... if it blows replace it with a 5amp... but i doubt it!
i got a 30amp fuse on my underbody kit... which is some cold cathodes and two 6foot led flexstrips
tho for the leds i sugest having a resistor for each led..... will give ya the brightest light and will keep a row of leds from burnen up.LOL
tho it always depends on how MANY leds your doing....... but i always sugest thier prewired leds...

very simple and easy to use! no solder skills needed.. and awhole lot quicker and even safer... cause thier prewired already have two layers of shrink wrap on them.. one around the resistor/power wire and the other over it on the ground wire....
and if you plan on soldering a bunch of leds... well it will be a HUGE PITA quicker than you can solder 5leds and resistors!
i know... i did the gauges of my truck in green leds in the stock bulb locations and half way thru i was REALY TIRED OF SOLDERING wires and prongs together... as well as finding out WHICH WAY the led had to be hooked up.. cause they are VERY polarity sensive... the power side HAS to have power and the ground has to have ground... or they wont work!
needless to say i had to unsolder half of my leds cause i soldered them in backwards
and also... if your going for some leds under a object like a seat... hell just go for some led flex strips
