Count on spending 25-35 AH a day on fridge, lights and pumps. Battery gives back only 80% of what you have put in. So the panel should harvest 10-15% more because some of this energy will go into battery in daytime and then will be taken from battery in the night, with losses. In other words, you need to harvest 35-40 AH.
100W is the bare minimum. In May-June, and if tilted, and if rotated towards the sun couple times a day, and if in the open space, it should harvest 30-35 AH a day in Denboulder area.
Too many "ifs" to my taste.
100W Renogy suitcases come with low-end controllers and poor SAE connectors (used to be Anderson connectors). As an easy introduction to solar it will probably work. You will need to do some assembling/wiring after you've unboxed it.
Upgrading to LED lights is very desirable, in this scenario.
Upgrading to AGM will not add any capacity. The only benefits would be slow self-discharge if you leave them unattended for +3 months, and the ability to handle high loads - that you don't have anyway.