OP, I split your post to form a new one here. I had to edit the title, but changed nothing else. If you'd like to change the title, click "Options" and then "Edit Message".
The new credit would be a drain on score but you'll see points return over the next several months.
What else is holding back your score? How is your CC utilization? Do you have any negative accounts reporting? If you haven't done so recently I recommend purchasing a FICO report from here. It'll list the top 1-4 negative things that hurt your FICO score the most. Armed with that info, you can target the most impactful items and go from there.