Hi echo what KatyMac has posted, being in rented accomodation isn't a problem as long as your landlord is ok with it. If you make good use of the space that is available for your mindees the size of your home wouldn't necessarily be an issue. I'm not arty either and can't draw for toffee but their are some fantastic resources online and from educational suppliers like Baker Ross that have ideas you can adapt, I am suprisingly good at wall displays of the mindees work which surprises me more that anyone else (but I digress).
Ofsted will tell you how many mindees and ages when you register, but in saying that it is often good to pick and choose the ages you will be more comfortable with from the ratios you get given, if you have a 9 mo you probably wouldn't be allowed a baby space until your LO was over 12mo, but given that it takes some time to complete the registration process it prob won't be an issue.
I had a cat when I started minding, didn't really have any parental issues, it died sadly (he was 16) we had a dog for a bit (peer pressure from DD) who kept peeing everywhere so it was an issue for me and it was re-homed. We now have another cat which I don't like, it's very good with the mindees and likes to play football with them, but is a total pain in the arse logistically, like having to lock out when mindees, asleep, eating, messyplay (likes to jump in the paint pots), I wouldn't get another pet again but I'm stuck with this one. One of my mums is allergic and she gets sniffly when her DS go home but she's ok with it. The children obv love it .
It's hard to say how long before you get any mindees, it took mee 2mths before I even got an enquiry, then had a bit of a flood and was full to poppin within a month , that was nearly 4yrs ago now and things are a bit sticky in the job area and I very rarely get enquiry's these days I have a space for the first time ever (normally have a waiting list) so I would do plenty of research in your local area see how many people mind, charges etc.
The other thing to bear in mind is the amount of courses and training you will need to do, all good CM do them regularly, and networking is good to keep sanity, talking to grown ups is a novelty , most of the courses are on an evening or w/end so this week I am out 2 eves 6 - 9.30 and all day Sat 8 - 5 so it can be a long week.
Also if you move after you have mindees you may limit yourself location wise and will have to re-reg new property with ofsted (took 4mths when I moved).
Despite all the downy bits theres a lot of uppy bits and you learn a great deal about yourself and how many skills you have, it's a strange life but can be very rewarding.