Step #1: Chromotagraphy kit
Your chromotagraphy kit should include these items: Shallow glass jar, 1x6 inch pieces of paper, water, and a bag to hold everything. Now, you can take the suspect's pen, and put it in an evidence bag. You can then write a line on a bottom of paper. Dip it in the water, and see different colors. You can then compare that to the note.
Your blood typing kit should include these: Alcohol, cotton swabs, toothpicks, pin, bandages, a pipette, and some blood typing liquid (available online). You can poke a hole in your finger, use the pipette to suck up 3 drops of your blood, (use the alcohol to rinse the area and use a bandage) you can then use the swabs to put the blood on. Then, yo
Step #3: Fingerprint Analysis
Your kit should include these items: Black paper, Baby powder, and clear tape. You can then use the baby powder on say, a cookie jar. Then, use the tape to lift the powder. Then, you can put that on the black paper to make it visible.
Make sure you have a drawer full of all of these items!