I know for some words it is a rule, such as in future tense, i.e. 'hablaré'

Reading and writing are the keys here.  The more you read, the more familiar everything becomes.

If you take the time to write and make sure that you are putting accents in the right places (wordreference.com) you will quickly engrain that too and you will notice when things aren't written correctly.

I think writing gets overlooked as one of the great supplements to language learning.  You can write what you hear in a dialogue pausing and writing, or you can also simply copy what you have in a book or a news article.  Write every day and watch how fast it starts to look less like a new language and more just like the English that you already know.

this pa que sepas might help you. if not its worth listening to just for fun

There are some very straight forward rules which dictate with syllables in Spanish words are stress and when once accent is required .  I started writing them for you but I found the link below which does a much better job then I can at explaining them.  So here is the link, if you have any questions please post them.
http://faculty.weber.edu/tmathews/grammar/marks.html

Mi libro faborito  es "The story of darknes and love" de AMOS Oz ,es una biografia de el autor y la historia de jeruslem .muy interesate

yo recomendaro

GUDY