There are different ways for asking for advice, for example :

– Could you … ? (eg. Could you tell me what you think about my project ?)
– I need your advice.
– Please can you advise me.
– What do you think I should do ?
– What would you do in my situation ?

There are also different ways to give advice, for example :

– You could … (eg. You could call him.)
– I think that you should … (eg. I think that you should speak to her.)
– You should … (eg. You should change your email address).
– It would be a good idea to…. (eg. It would be a good idea to write him a letter.)