1. A 5A panel is not even worth it. 11A should be considered a minimum to be able to deal with not only self discharge but charging during the week.
2. Solar controllers have been discussed sooooooooo much on boating forms on the web, including this one and at Cruisers & Sailing Forums
, that it boggles the mind. I recommend you Google the topic and you'll have enough to read for thousands of years!
Really. Here's an example: MPPT vs PWM Solar Regulators - Cruisers & Sailing Forums
You could also Google solar regulators. There are many solar companies websites that include this information in great detail for boaters, like Morningstar.