re starting on monday and need advice

I have 3 days off work to get back into it lol.
but i also was wondering.... i want to start the gym and tone my arms up for my strapless wedding dress.

Will this also boost my weight loss aswell as i will be burning fat?

Also when can you start excersising (sp)

I'd give it at least a week then just build up too a work out , you don't want to pass out , good luck