The Levels determine how many gigs you can have at any given time.
Check out the perks of hitting each level; you’ll see the number of active gigs you can have will increase as your Level increases.
I started out with 6 or 7 gigs, to figure out where my work was needed and useful. I realized really fast that I can’t compete in photoshop – I took that gig down. Sound/audio editing wouldn’t work for me either as I use basic software. And then, I realized that my voice and my writing are the best things I can offer because I am a native English speaker and decent writer.
So I started expanding my writing, and combining them with audio, and branched out into proofreading and fluffing (adding length without changing content). My highest sales told me where I should focus my work. When my basic audio gig got a lot of attention (at $5 for 500 words) I decided to make a niche gigs (like voice mail, explainer video, etc.). Likewise, I made separate writings for my erotica work and my professional work because companies who want professional work probably don’t want to hear about my erotica work.
I think it’s reasonable to start out with a number of different things you’re sure you can do wel. And depending on what works, take it and run!
Also, try diversifying which categories your gigs are in; it gives you a wider view of what people want because you can see the Buyer Requests only for categories within which you have an active gig. The more BR you can see, the more you see the needs of the community and can respond to them.
Hope that helps!