Removing a Load Bearing Wall

[Jesse Os]

I am in search of some guidance on removing a load bearing wall for a house I am renovating. I am not so much concerned with the process as what the state codes are (i.e. length of support beam without vertical support, materials to use, etc).

Either way I would also like to have someone come in and take a look. Does anyone have any recommendations for general contractors and structural engineers in Western Mass?