Hi everyone, been searching and checking all the really useful stuff on here and I have a few specific questions that I would welcome opinions on.
Moved to East Sussex last year and at now that stage of life when it's time to finally get a boat

- especially now I'm only 15 mins from the Hastings/Bexhill/Eastbourne coast.
I was lucky enough to spend 20 odd years of holidays in Majorca where my parents moved to a long time ago and did a lot of skiing out there with the old man's boat. He had a basic 18ft SeaRay with a 150hp Mercrusier sterndrive and even that needed full effort for a deep water start on a slalom mono - with a wider Jobe 'fun' ski it was obviously much easier.
As with everyone I'm up against budget, space, convenience etc - it would be great to be able to store the boat in our garage (about 5m long) but is a 4-5m rib really suitable for taking out say 2 adults + 2 small kids (maybe sometimes 4 adults) and what sort of power would I need? Regardless, are deep water (adult) mono starts totally out of the question (even on a 'fun' mono ski) and is it a case of having to go back to dropping one?
From searching the forum many say a 4m with a 40 - 50hp is fine? Is there is a big difference in going up to a 5m or bigger (and presumably a bigger engine would be needed)? - I have a nervous (of boats) wife too so bigger/stable may be better... For my part the calm, warm seas of a bay in Majorca are not the same as the south coast of England of course and I intend to do the RYA 1+2 course. Intended use is pottering around, skiing/kneeboarding and maybe some inland use up on the broards.
Lastly how easy is it to manhandle/self-launch a rib of this size? I'm a Landy nut so lucky to have a 110 Defender so at least the trailering it is one problem solved!
Sorry for the general nature of the Q's - new to ribs and there is so much to learn.