Days of the week:
To say that you do something every Monday, use "le" before the day of the week. To say that you are doing something this Monday, don't add anything before Monday.
Je joue au foot le lundi. = I play soccer on Mondays.
Je joue au foot lundi. = I am playing soccer this Monday.
vouloir = to want
je veux nous voulons
tu veux vous voulez
il/elle/on veut ils/elles veulent
Je voudrais is a more polite way of saying I want.