In English, we normally only stress the first syllable in a word, and turn all of the following vowels into "UH". In Sindarin, you'll have to work a little harder.

Dividing the Syllables

Syllables are determined by vowel-sounds. There is one vowel or diphthong sound per a syllable. For example, "awarth" (abandonment) would be separated out like this: aw-arth

The consonants in Sindarin go on the ends of the syllables, not the beginnings (unless it is the very first syllable). For example, "bregolas" (fierceness) would be separated out like this: breg-ol-as.

The Placing of Stress

Stress is extra emphasis put on a syllable. Stess is shown by putting an apostrophe after the vowel of the stressed syllable. I'm splitting the syllables with dashes to show you how they work.

If the word is 2 or 3 syllables long then the first syllable gets the stress.
For example: balan (vala)-->ba'l-an

If it is longer than 3 syllables, the third syllable from the end gets the stress.
For example: aronoded (uncountable)-->ar-o'n-od-ɛd

Special Syllables

There are three things that you need to look out for that change the way a word is stressed.
Accents (Acute and Circumflex)
Diphthongs (AE, AI, AU, AW, EI, OE, and UI - just like we learned in Lesson 1.)
Multiple Consonants (This only counts if they come at the end of the syllable. They can be two of the same letter side by side. They could also be several different consonants next to each other. Remember that CH, DH, PH, and TH only count as one consonant.)

The last special syllable in a word gets the stress.
For example:
Tuilinn (a swallow)-->tuil-i'nn
Gobennathren (Historical)-->go-bɛnn-a'θr-ɛn

If the special syllable comes at the end of a word that's three syllables long or longer, then the third syllable from the end gets the stress, special or not.
For example:
Orbelain (Sunday)-->o'rb-ɛl-ain
Espalass (foaming)-->ɛ'sp-al-as

Homework:

Write the following Sindarin words with their stress and pronunciation. Use the following special letters to show the pronunciation:

Separate syllables with dashes, so I can more clearly see your reasoning.