many days back i have seen an awesome video on youtube for making earrings..i extended the same procedure to make a necklace cum bracelet..
for making it we need
beads (2 colors)
size 12 needle
thread spool (take transparent thread if possible)
clasps
scissors

Step 1:

take a bead and thread it through needle
tie a knot at another end of thread
knot will secure a bead in place

Step 2:

now thread 4 same colored beads then 1 another colored bead and 1 same colored bead
in short you will have 5 same colored beads (including knotted 1) one 2nd colored bead and one same colored bead
now pass a needle through 4 same colored beads (including knotted 1) staring from knotted 1
this will make a loop

Step 3:

now take 2 same colored beads 1 another colored bead and 1 same colored bead
pass a needle through 4 beads next from the knotted 1 (4th bead will be 1st bead from recently added beads)
this will make another loop
again take 2 same colored beads 1 another colored bead and 1 same colored bead
again pass a needle through 4 beads (as shown in photo)

repeat same procedure till you get desired length