Hi Lisa and welcome to the boards

Big hugs to you as i know how hard it is in the early days
Ok, to bump up your supply you can pump after each feed to start with. This will get the milk flowing again

A lot of lo's (little ones) are very sleepy in the early weeks so don't worry there, there is a hormone in your milk that does this.
Are you single side feeding?
How often are you feeding?
If he is only taking a little at each feed, try to fit in more feeds in the day say every 2hrs doing all the above that you mentioned to get him to take as much as you can. Something else you can try is breast compressions, there is more info on the FAQ's board. Basicaly you massage the breast in a downwards motion a little like milking a cow lol (excuse the expression). If you are double side feeding then try to do one side more often as this will get to the fattier milk to help with weight gain.
If you really are stuggling there is something called the 'SNS' which is a little tube which you pop in the side of there mouth when feeding and you can put your pumped milk in that. Im not too experienced with this product so i will ask someone else if they think this might be a good option for you.
There are many women on this site with a range of lots of problems, so please try not to worry too much and im sure that someone will have an answer for you

More hugs
Kate x