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Congrats, never too late to start. Just keep your payment history clean and utilization low and in a year you will have all of the limits you will ever need. I wouldn't combine these accounts until they have substantial limits and even then you may not want to mess with your average age of accounts. I started my rebulid in mid 2014 with a $300 limit Cap One Platiunum card which is now over 4k and my total CL's are about 100k. Be patient, apply smartly and you will be in great shape.
That's great OP. I started with the same CL and it's now grown to 6500. Treat it well, and cap1 will reward you