The Saab 2000 is a great plane to start with, it is the fastest turboprop available, had low fuel consumption and is relatively cheap to lease.
There are a couple things to note with starting with a Saab
1) Rent older:Cheaper Lease, never lease beyond D-Check(dump before) ex: D check is in 4.2 years, lease for 4
2)Fly it often, pack the routes, 4-5 routes/day min to start generally 60-300nm from base airport, and then work your way out.
3) On routes above 3/400 nm change config to 51 standard econ seats, especially if in competitive airport(3 or more airlines based) as the Good comfort factor really boosts the plane
4) Remember you have the advantage over a ERJ/CRJ in being able to underprice your flight, they are fuel suckers, and need better than 70%LF to come close to a true profit, whereas a saab can do much less.
They are great regional aircraft and as to start, just keep piling on routes as you get the money, dont stop leasing, and in my recommendation I do not add new fleet types till i have 20 or more of a type.
If you want E-Jets go for the E-190's/195's but never at start, they are hard to find on the used market, relatively fuel inefficient, and better for longer routes and established airlines.