peeing in house and leaving alone

Can anyone give me some advise. We have just got a pug bitch two year old, she came from a home with other pugs. She seems a typical happy dog great with people especially the kids. The only issues we seem to have is she does not wee very often when going for walks but tends to wait until she gets back in the house. She is walked four to five times a day she poos when she is out but that's about all. Also she is not to keen about being left by her self and barks and wines when we leave the room.
Can anyone give us some advice Please.