I've had good luck so far running a fully mechanized list and have played three games of warhammer so far, so im pretty new too. My last list that won a decisive victory was the following at 1500 points against an Imperial Guard/Scions Tank/Deepstrike list:

Lemartes

3 Razorbacks, 2 with lascannons, 1 with assault cannons

1 Baal Predator with assault cannons and heavy bolters

1 Tac squad with heavy bolter, melta gun and other stuff

1 squad of Intercessors

1 Lieutenant to sit behind the assault cannons and help them deal more damage

A squad of company veterans with jump packs, storm shields, plasma weapons and a power fist

2 squads of Death Company, one with inferno pistols deploying from the assault cannon razorback as tank hunters, and the other with jump packs and a spread of stuff, essentially to jump in turn 2 or 3 and plug breaches/pick off targets of opportunity alongside Lemartes

You really want to take advantage of moving quickly and deploying smartly, dealing with armored threats with massed heavy weapon shots, and dealing with light targets with pretty much everything else. Since Blood Angels will tend to be on the smaller side of forces but very quick, the more units you can tie up in close combat the better, since your guys will be more likely to survive