Advice Needed I want to gain weight.

Go to the doctor, talk to a specialist if you can.

Look at forum resources that speak about bulking in general and apply some of those principles. bb.com has a lot of great resources
There are some factors to consider which include the level of physical activity you currently do each day and how much and when you eat.

I am fortunate (?) enough not to have to worry about bulking (only cutting) when im dieting but it is important to take small steps and adjust your diet to see what works or gives you healthy results

Good luck