Is a B class/share mutual fund good if you have less then $5000 to spend on it?

How long do you think you might hold the shares? In general Class A shares are a better deal than class B shares but that is not always the case. Class B shares have a higher expense ratio than A shares, about 0.75% and there is a deferred sales charge for about 6 years. There might be an exception under certain circumstances. With the B shares you can purchase 5.75% more shares up front. If the shares appreciate rapidly in value you might possibly in that case come out ahead with the B shares. With American Funds Capital World Growth and Income the 10 year return between the A and B shares is only about 0.02% in favor of the A shares. But the 3 year return favors the B shares by 0.56%.
This might be an exceptional case because these particular shares have had a very great 3 year ROI 21+% annually.

Absolutely NOT - high expenses & deferred loads. Pick a no load fund from Fidelity, Vanguard or TRowe Price. Do a little research here. There are many excellent funds out there without loads & lower expenses.

WWW.MORNINGSTAR.COM is an excellent place to research funds.

Absolutely not.

Low cost, no fee, index mutual funds only.

B class shares are nothing more than back end load fees, meaning the manager gets paid out of the returns of the fund. Invest in no load funds with Vanguard or T. Rowe Price.