Need help

My husband and I are both 25 yrs old. I have to childern and he has none . W have been together for 4 years and have been trying since 2011 to have a baby. Someone told me that it would be hard for me to have another child due to the fact my 2 boys are 11months and 2 weeks apart ! As far as I know my eggs are still good and his sperm is good . Does anyone know hoes are what we need to do to find out what we can do to have more kids . Plus I'm New to this app and really just need a buddy to walk me thru it and help !